google search

Google Search results web crawler (Updates)

A continuation of the project based on the following post “Google Search results web crawler (re-visit Part 2)” & “Getting Google Search results with Scrapy”. The project will first obtain all the links of the google search results of target search phrase and comb through each of the link and save them to a text file.

Two new main features are added. First main feature allows multiple keywords to be search at one go. Multiple search phrases can be entered from a target file and search all at one go.

There is also an option to converge all the results of all the search phrases. This is useful when all the search phrases are related and you wish to see all the top ranked results group together. The results will display all the top search result of all the key phrases followed by the 2nd and so forth.

Other options include specifying the number of text sentences of each result to print, min length of the sentence, sort results by date etc. Below are the key options to choose from:

    NUM_SEARCH_RESULTS = 30  # number of search results returned
    SENTENCE_LIMIT = 50
    MIN_WORD_IN_SENTENCE = 6
    ENABLE_DATE_SORT = 0

The second feature is an experimental feature that deal with language processing. It will try to retrieve all the noun phrases from all the search results and note the its frequency. The idea is to retrieve the most popular noun phrases based on the results of all the search, this is something similar to word cloud.

This is done using the python pattern module which also deal with the HTML request and processing used in the script. Under the pattern module, there is sub module that handles natural language processing. For this feature, the pattern module will tokenize the text and (part-of-speech) tag each of the word. With the in-built tag identifcation, you can specify it to detect noun phrase chunk tag or NP (Tags: DT+RB+JJ+NN + PR). For more part-of-speech tag, you can refer to pattern website. I have included part of the code for the noun phrase detection (Under pattern_parsing.py).

def get_noun_phrases_fr_text(text_parsetree, print_output = 0, phrases_num_limit =5, stopword_file=''):
    """ Method to return noun phrases in target text with duplicates
        The phrases will be a noun phrases ie NP chunks.
        Have the in build stop words --> check folder address for this.
        Args:
            text_parsetree (pattern.text.tree.Text): parsed tree of orginal text

        Kwargs:
            print_output (bool): 1 - print the results else do not print.
            phrases_num_limit (int): return  the max number of phrases. if 0, return all.
        
        Returns:
            (list): list of the found phrases. 

    """
    target_search_str = 'NP' #noun phrases
    target_search = search(target_search_str, text_parsetree)# only apply if the keyword is top freq:'JJ?+ NN NN|NNP|NNS+'

    target_word_list = []
    for n in target_search:
        if print_output: print retrieve_string(n)
        target_word_list.append(retrieve_string(n))

    ## exclude the stop words.
    if stopword_file:
        with open(stopword_file,'r') as f:
            stopword_list = f.read()
        stopword_list = stopword_list.split('\n')

    target_word_list = [n for n in target_word_list if n.lower() not in stopword_list ]

    if (len(target_word_list)>= phrases_num_limit and phrases_num_limit>0):
        return target_word_list[:phrases_num_limit]
    else:
        return target_word_list
        
def retrieve_top_freq_noun_phrases_fr_file(target_file, phrases_num_limit, top_cut_off, saveoutputfile = ''):
    """ Retrieve the top frequency words found in a file. Limit to noun phrases only.
        Stop word is active as default.
        Args:
            target_file (str): filepath as str.
            phrases_num_limit (int):  the max number of phrases. if 0, return all
            top_cut_off (int): for return of the top x phrases.
        Kwargs:
            saveoutputfile (str): if saveoutputfile not null, save to target location.
        Returns:
            (list) : just the top phrases.
            (list of tuple): phrases and frequency

    """
    with open(target_file, 'r') as f:
        webtext =  f.read()

    t = parsetree(webtext, lemmata=True)

    results_list = get_noun_phrases_fr_text(t, phrases_num_limit = phrases_num_limit, stopword_file = r'C:\pythonuserfiles\google_search_module_alt\stopwords_list.txt')

    #try to get frequnecy of the list of words
    counts = Counter(results_list)
    phrases_freq_list =  counts.most_common(top_cut_off) #remove non consequencial words...
    most_common_phrases_list = [n[0] for n in phrases_freq_list]

    if saveoutputfile:
        with open(saveoutputfile, 'w') as f:
            for (phrase, freq) in phrases_freq_list:
                temp_str = phrase + ' ' + str(freq) + '\n'
                f.write(temp_str)
            
    return most_common_phrases_list, phrases_freq_list

The second feature is very crude and give rise to quite a number of redundant phrases. However, in some cases, are able to pick up certain key phrases. Below are the frequency results based on list of the search key phrases. As seen, the accuracy still need some refinement.

Key phrases

Top cafes in singapore
where to go to for coffee in singapore
Recommended cafes in singapore
Most popular cafes singapore

================
Results

=================

Singapore 139
coffee 45
the past year 23
plenty 23
the Singapore cafe scene 22
new additions 22
View Photo 19
PH 16
cafes 14
20 Best Cafes 13
Fri 11
Coffee 11
Nylon 10
Thu 10
Artistry 10
Indonesia 10
The coffee 9
The Plain 9
Chye Seng Huat Hardware 9
the coffee 9
Photos 9
you re 9
Everton Park 8
sugar 8
Hours 8
t 8
Changi Airport 7
time 7
Food 7
p. 7
Common Man Coffee Roasters 7
Tel 7
Rise & Grind Coffee Co 6
good coffee 6
40 Hands 6
a lot 6
the cafe 6
The Coffee Bean 6
your friends 6
Malaysia 6
s 6
a cup 6
Korea 6
Sarnies 6
Waffles 6
Address 6
Chinese New Year 6
desserts 6
the river 6
Taiwan 6
home 6
the city 5
service 5
the best coffee 5
Tea Leaf 5
great coffee 5
a couple 5
the heart 5
people 5
the side 5
Nylon Coffee Roasters 5
hours 5
Singaporeans 5
food 5
any time 5
eve 5
eggs 5
a bit 5
Eve 5
the day 5
kopi 5
Thailand 5
brunch 5
their coffee 5
Chinatown 5
Restaurants 4
Brunch 4
the top 4
Jalan Besar 4
Ideas 4
Dutch Colony 4
night 4
Cafes 4
a variety 4
Visit 4
course 4
Melbourne 4
The Best 4

Main script can be obtained from Github.

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Saving images from google search using Selenium and Python

Below is a short python script that allows users to save searched images to local drive using Image search on Google. It requires Selenium as Google requires users to press the “show more results” button and the scroll bar to move all the way to the bottom of page for more images to be displayed. Using Selenium will be an easier choice for this function.

The below python script will have the following:

  1. Enable users to input multiple search keywords either by entry or get from file. Users can leave the program to download on its own after creating a series of search keywords.
  2. Based on each keyword, form the google search url. Most of the parameters inside the google search url can be fixed. The only part that required changing is the search keyword as highlighted below in red.
  3. Run google search and obtain page source for the images. This is run using Selenium. To obtain the full set of images, Selenium will help to press the button and scroll the scrollbar to bottom of pages so that Google can load the remaining images. There seems to be a hard quota of 1000 pics for image search on Google.
  4. Use python pattern and xpath to retrieve the corresponding url for each image. The xpath will use the following tag:
    • tag_list = dom(‘a.rg_l’) #a tag with class = rg_l
  5. Based on each url, it will check the following before downloading the image file:
    • whether there is any redirect of site. This is done using Python Pattern redirect function.
    • check the extension whether it is a valid image file type.
  6. The image files are downloaded to a local folder (generated by date). Each image will be label according to the search key and a counter. There will be a corresponding text file mapping the image label to the image url for reference.
import re, os, sys, datetime, time
import pandas
from selenium import webdriver
from contextlib import closing
from selenium.webdriver import Firefox
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC

from pattern.web import URL, extension, cache, plaintext, Newsfeed, DOM

class GoogleImageExtractor(object):

    def __init__(self, search_key = '' ):
        """ Google image search class
            Args:
                search_key to be entered.

        """
        if type(search_key) == str:
            ## convert to list even for one search keyword to standalize the pulling.
            self.g_search_key_list = [search_key]
        elif type(search_key) == list:
            self.g_search_key_list = search_key
        else:
            print 'google_search_keyword not of type str or list'
            raise

        self.g_search_key = ''

        ## user options
        self.image_dl_per_search = 200

        ## url construct string text
        self.prefix_of_search_url = "https://www.google.com.sg/search?q="
        self.postfix_of_search_url = '&source=lnms&tbm=isch&sa=X&ei=0eZEVbj3IJG5uATalICQAQ&ved=0CAcQ_AUoAQ&biw=939&bih=591'# non changable text
        self.target_url_str = ''

        ## storage
        self.pic_url_list = []
        self.pic_info_list = []

        ## file and folder path
        self.folder_main_dir_prefix = r'C:\data\temp\gimage_pic'

    def reformat_search_for_spaces(self):
        """
            Method call immediately at the initialization stages
            get rid of the spaces and replace by the "+"
            Use in search term. Eg: "Cookie fast" to "Cookie+fast"

            steps:
            strip any lagging spaces if present
            replace the self.g_search_key
        """
        self.g_search_key = self.g_search_key.rstrip().replace(' ', '+')

    def set_num_image_to_dl(self, num_image):
        """ Set the number of image to download. Set to self.image_dl_per_search.
            Args:
                num_image (int): num of image to download.
        """
        self.image_dl_per_search = num_image

    def get_searchlist_fr_file(self, filename):
        """Get search list from filename. Ability to add in a lot of phrases.
            Will replace the self.g_search_key_list
            Args:
                filename (str): full file path
        """
        with open(filename,'r') as f:
            self.g_search_key_list = f.readlines()

    def formed_search_url(self):
        ''' Form the url either one selected key phrases or multiple search items.
            Get the url from the self.g_search_key_list
            Set to self.sp_search_url_list
        '''
        self.reformat_search_for_spaces()
        self.target_url_str = self.prefix_of_search_url + self.g_search_key +\
                                self.postfix_of_search_url

    def retrieve_source_fr_html(self):
        """ Make use of selenium. Retrieve from html table using pandas table.

        """
        driver = webdriver.Firefox()
        driver.get(self.target_url_str)

        ## wait for log in then get the page source.
        try:
            driver.execute_script("window.scrollTo(0, 30000)")
            time.sleep(2)
            self.temp_page_source = driver.page_source
            #driver.find_element_by_css_selector('ksb _kvc').click()#cant find the class
            driver.find_element_by_id('smb').click() #ok
            time.sleep(2)
            driver.execute_script("window.scrollTo(0, 60000)")
            time.sleep(2)
            driver.execute_script("window.scrollTo(0, 60000)")

        except:
            print 'not able to find'
            driver.quit()

        self.page_source = driver.page_source

        driver.close()

    def extract_pic_url(self):
        """ extract all the raw pic url in list

        """
        dom = DOM(self.page_source)
        tag_list = dom('a.rg_l')

        for tag in tag_list[:self.image_dl_per_search]:
            tar_str = re.search('imgurl=(.*)&imgrefurl', tag.attributes['href'])
            try:
                self.pic_url_list.append(tar_str.group(1))
            except:
                print 'error parsing', tag

    def multi_search_download(self):
        """ Mutli search download"""
        for indiv_search in self.g_search_key_list:
            self.pic_url_list = []
            self.pic_info_list = []

            self.g_search_key = indiv_search

            self.formed_search_url()
            self.retrieve_source_fr_html()
            self.extract_pic_url()
            self.downloading_all_photos() #some download might not be jpg?? use selnium to download??
            self.save_infolist_to_file()

    def downloading_all_photos(self):
        """ download all photos to particular folder

        """
        self.create_folder()
        pic_counter = 1
        for url_link in self.pic_url_list:
            print pic_counter
            pic_prefix_str = self.g_search_key  + str(pic_counter)
            self.download_single_image(url_link.encode(), pic_prefix_str)
            pic_counter = pic_counter +1

    def download_single_image(self, url_link, pic_prefix_str):
        """ Download data according to the url link given.
            Args:
                url_link (str): url str.
                pic_prefix_str (str): pic_prefix_str for unique label the pic
        """
        self.download_fault = 0
        file_ext = os.path.splitext(url_link)[1] #use for checking valid pic ext
        temp_filename = pic_prefix_str + file_ext
        temp_filename_full_path = os.path.join(self.gs_raw_dirpath, temp_filename )

        valid_image_ext_list = ['.png','.jpg','.jpeg', '.gif', '.bmp', '.tiff'] #not comprehensive

        url = URL(url_link)
        if url.redirect:
            return # if there is re-direct, return

        if file_ext not in valid_image_ext_list:
            return #return if not valid image extension

        f = open(temp_filename_full_path, 'wb') # save as test.gif
        print url_link
        self.pic_info_list.append(pic_prefix_str + ': ' + url_link )
        try:
            f.write(url.download())#if have problem skip
        except:
            #if self.__print_download_fault:
            print 'Problem with processing this data: ', url_link
            self.download_fault =1
        f.close()

    def create_folder(self):
        """
            Create a folder to put the log data segregate by date

        """
        self.gs_raw_dirpath = os.path.join(self.folder_main_dir_prefix, time.strftime("_%d_%b%y", time.localtime()))
        if not os.path.exists(self.gs_raw_dirpath):
            os.makedirs(self.gs_raw_dirpath)

    def save_infolist_to_file(self):
        """ Save the info list to file.

        """
        temp_filename_full_path = os.path.join(self.gs_raw_dirpath, self.g_search_key + '_info.txt' )

        with  open(temp_filename_full_path, 'w') as f:
            for n in self.pic_info_list:
                f.write(n)
                f.write('\n')

if __name__ == '__main__':

    choice =4

    if choice ==4:
        """test the downloading of files"""
        w = GoogleImageExtractor('')#leave blanks if get the search list from file
        searchlist_filename = r'C:\data\temp\gimage_pic\imgsearch_list.txt'
        w.set_num_image_to_dl(200)
        w.get_searchlist_fr_file(searchlist_filename)#replace the searclist
        w.multi_search_download()

Generate NLP training sets using Google search module

In sentiment analysis or natural language processing, training sets are required to create the different classifiers in order to interpret phrases of words or assign appropriate sentiment features to particular phrases or texts . In general, the larger the training sets the higher the accuracy of the interpreted sentiment or results.

To produce a large training set, it is required to source manually large number of raw data and classifier them manually, which in turn, a tedious process. Google search results might be one alternative to collect the training sets which are already classified due to the defining boundaries set by the Google search keywords.

Hence, one of the way to create a large training set is to utilize the Google search module described in the previous post. We can input the description of the end target result (and hence, the classifier)  and the google search will return the brief description. The brief description will usually contain snippets of news/event relate up to the events or end results. These provide the basis for the classifier.

An example of such use will be to classify stocks news into positive news (that make stocks prices rise) or negative news (that cause stock prices to fall). For positive stock outlook we can use the following keywords”Shares rise by xxx” or “Price jump”, the Google search results will return all the contents or news that have the keywords. This will eventually provide all the positive sentiment phrases or news that will predict whether prices increase or fall. The following diagram simplify the procedure.

Creating Classifiers from Google Search

To make it easier for user to generate the classifier, a GUI function is created. Below GUI is generated using the wx,itempicker module. Users can input the google search texts (can have multiple entries separated by “;”) that will hint the classifiers and run the Google search and all the links results will be displayed on the left text box. The user can then proceed to select the items, After which all the items are selected, the user can proceed to save all the data in a file or copy to clipboard for further processing. While copying, it can append the classifier label to the sentences.

Classifer GUI

The final output are copied to clipboard. Below is the output. Note that commas except the classifier label parts are removed from the sentences.

Japan, China Stocks Lead Asia Gains on Yen Data – ABC News,pos
Shares Extend Gains on Overseas Economic News – NYTimes.com,pos
Rising Share Prices on London South East. Share Prices on all …,pos
Stock market logs 5th straight week of gains as Dow hits record high …,pos
Stock market rise sharply after nightmarish week for Dow Jones …,pos
Stock market wants to rise despite global fears – CNBC.com,pos
Stock markets could gain despite Big Oil’s pain | Reuters,pos
Stocks end mostly up as gains extend into 4th week | Stock market …,pos

Sample of the codes below. The code mainly used to define the various wx widgets. It requires the wx module and for the clipboard, it requires another script for the clipboard function. Alternatively, the copy function can be easily replaced by saving to target file or other storage.

import os, sys, time, datetime

## wx imports
import wx
from wx.lib.itemspicker import ItemsPicker,EVT_IP_SELECTION_CHANGED, IP_SORT_CHOICES
from wx.lib.itemspicker import IP_SORT_SELECTED,IP_REMOVE_FROM_CHOICES

## Google search module using python pattern
from Python_Google_Search_Retrieve import gsearch_url_form_class

## pyET_tools import, clipboard, for storing data to clipboard,
## can be substitued with alternative such as storing to file.
import pyET_tools.Clipboard_handler as Clip

class MyPanel(wx.Panel):
    def __init__(self,parent):
        wx.Panel.__init__(self,parent)
        self.parent = parent

        ## list of parameters
        self.google_results= []
        self.add_classifier_str = 'pos' # add either classifer pos or neg to the str\
        self.search_word_list = [] #
        self.picked_item_list = []

        ## wx widgets
        ## Top panel display sizer for google search keywords input
        ## Hold the search Enter box and button to execute the search
        ## keywords are entered in single box but separate by ;
        top_display_sizer = wx.BoxSizer(wx.HORIZONTAL)
        search_label = wx.StaticText(self, -1, "Google Search keywords")
        self.search_textbox = wx.TextCtrl(self, -1, size=(400, -1))
        search_btn = wx.Button(self, -1, "Search")
        search_btn.Bind(wx.EVT_BUTTON, self.OnSearch)
        top_display_sizer.Add(search_label, 0, wx.ALL, 5)
        top_display_sizer.Add(self.search_textbox, 0, wx.ALL, 5)
        top_display_sizer.Add(search_btn, 0, wx.ALL, 5)

        ## Mid panel sizer
        ## Hold the classifier label Enter box and also the button for copy data to clipboard
        ## The button can be modified to save the picked items.
        mid_display_sizer = wx.BoxSizer(wx.HORIZONTAL)
        classifier_label = wx.StaticText(self, -1, "Classifier label")
        copy_output_btn = wx.Button(self, -1, "Copy")
        copy_output_btn.Bind(wx.EVT_BUTTON, self.CopyPickedItems)
        self.classifier_textbox = wx.TextCtrl(self, -1, self.add_classifier_str, size=(125, -1))
        mid_display_sizer.Add(classifier_label,0, wx.ALL, 5)
        mid_display_sizer.Add(self.classifier_textbox, 0, wx.ALL, 5)
        mid_display_sizer.Add(copy_output_btn, 0, wx.ALL, 5)

        ## Main sizer
        ## Item picker widgets.
        main_sizer =wx.BoxSizer(wx.VERTICAL)
        main_sizer.Add(top_display_sizer, 0, wx.TOP|wx.LEFT, 3)
        main_sizer.Add(mid_display_sizer, 0, wx.TOP|wx.LEFT, 3)
        self.ip = ItemsPicker(self,-1, [], 'All items', 'Selected items:',ipStyle = IP_SORT_CHOICES)
        self.ip.Bind(EVT_IP_SELECTION_CHANGED, self.OnSelectionChange)
        self.ip._source.SetMinSize((-1,150))
        main_sizer.Add(self.ip, 1, wx.ALL|wx.EXPAND, 10)
        self.SetSizer(main_sizer)
        self.Fit()

    def OnSearch(self,e):
        """ Generate the list of google search results.
            Set the items on the left textctrl box.
        """
        gs_keywords_list = self.split_google_keywords()
        self.OnGoogleRun(gs_keywords_list)
        self.ip.SetItems(self.google_results)

    def split_google_keywords(self):
        """ Split the google keywords  based on ";" for multiple keywords entry.
            Returns:
                (list): list of keywords to be used.
                        Remove any empty words accidentially bound by ;
        """
        search_items =  self.search_textbox.GetValue()
        search_items_list = search_items.split(';')
        return [n for n in search_items_list if n!='']

    def append_classifier_to_text(self, selected_txt_list):
        """ Add the classifier to the selected text.
            Args:
                selected_txt_list (list): list of str that contains the selected text.
            Returns:
                (list): list with classifer text added. eg. ",pos"
        """
        return [n + ',' + self.add_classifier_str for n in selected_txt_list]

    def get_classifier_txt(self):
        """ Query and Set the classifier txt to self.add_classifier_str
            Query from the self.classifier_textbox.
        """
        self.add_classifier_str = self.classifier_textbox.GetValue()

    def CopyPickedItems(self,e):
        """ Copy the selected item to clipboard.
            Get all the items on the selected list, append the pos str and save to clipboard
        """
        ## get classifier text
        self.get_classifier_txt()

        ## get the picked items
        selected_txt_list = self.picked_item_list

        ## append classifier text to picked items
        selected_txt_list = self.append_classifier_to_text(selected_txt_list)

        ## copy the items to clipboard
        Clip.copy_list_to_clipbrd(selected_txt_list)

    def OnSelectionChange(self, e):
        """ Trigger for the item picker when items are being selected or picked.
            Set to self.picked_item_list.
        """
        self.picked_item_list =  e.GetItems()

    def OnGoogleRun(self, search_words):
        """ Run the google search results to get all the link

        """
        ## User options
        NUM_SEARCH_RESULTS = 50                # number of search results returned

        ## Create the google search class
        hh = gsearch_url_form_class(search_words)
        hh.print_parse_results = 0

        ## Set the results
        hh.set_num_of_search_results(NUM_SEARCH_RESULTS)
        hh.enable_sort_date_descending()# enable sorting of date by descending. --> not enabled

        ## Generate the Url list based on the search item
        url_list =  hh.formed_search_url()

        ## Parse the google page based on the url
        hh.parse_all_search_url()
        hh.consolidated_results()

        self.google_results = hh.merged_result_desc_list
        print 'End Search'

class MyFrame(wx.Frame):
    def __init__(self, parent, ID, title):
        wx.Frame.__init__(self, parent, ID, title,pos=(50, 150), size=(950, 520))#size and position
        self.top_panel = MyPanel(self)

class MyApp(wx.App):
    def __init__(self):
        wx.App.__init__(self,redirect =False)
        self.frame= MyFrame(None,wx.ID_ANY, "item picker")
        self.frame.Show()

def run():
    try:
        app = MyApp()
        app.MainLoop()
    except Exception,e:
        print e
        del app

if __name__== "__main__":
    run()

(more…)

Google Image Search with Python (part 1)

Google has a image  search feature that allows users to input a image and search for related web pages that embed the image (reverse image search). Google also shows related images that are similar to the targeted image.

There are multiple ways to input the image into Google search such as drag-and-drop to the search input box, upload the file or provide an url link of the image. Note that Google will store all the images that have been uploaded for its own internal use.

The project here will try to make use of the image url link to pull the Google results automatically. The overall flow is as below:

  1. Upload image to a fixed location that can provide a public link of the image url.
  2. Combined the image url to the Google image search url
  3. Google image search url is of the following format
  4. Scrape the Google Result page returned from the combined url for the results.

Item 1 is difficult as it would required a place to upload and store the new image and at the same time return the correct url. The concept is to use cloud storage such as Dropbox or BOX which allow public to view the file if provide the url link and at the same time acts as regular folder on the local computer.

This project will use BOX to perform item 1. It requires an BOX account and installation of BOX to local computer. After which, the following steps are required.

  1. Create a temp folder and a dummy image (.jpg)
  2. Note the image file name. This should not be changed as it will affect the final url.
  3. Copy the public link and paste to browser. The public link will be used in script for subsequent pulling.
  4. The browser will re-direct to the BOX image viewer. The manual way to retrieve the image url can be by right clicking on the image and select image url.
  5. The image will be of the following format.
  6. If the image is subsequently be overwritten, the filename should not change BUT the file_version  will be updated hence the url will change with the new file version (highlighted in blue)

The script for this part will be to automatically get the url from the BOX page given the public link. Note that inputting the url and direct scraping of the webpage will not get the image url as it need to wait for the javascript execution.

One way to overcome this is to use Selenium (Web browser Automation). This will automatically execute any Javascript and retrieved the final html of the page. With the final html, we can use the Python pattern DOM object to parse the image url.

Below is the class for the getting the image url to be inputted to Google search. For this post, only this portion is displayed.

import re, os, sys, math, time, datetime, shutil
from pattern.web import URL, DOM, plaintext, extension, Element, find_urls
from contextlib import closing
from selenium.webdriver import Firefox
from selenium.webdriver.support.ui import WebDriverWait

class BoxImageUrl(object):
    """ Fetch the url of a public share link pic.
        Can write a image to that particular file and get the latest url of that file
        Need to wait for sometime for the image to load --> can use before and after to see any chnage in the words
        Need to wait for the box image to load up.

        Note:
        self.share_folder_url  --> public folder link of BOX. Set by user.
        self.local_image_store_path --> placeholder for all new image. All new image is to overwrite this file.
                                        Set by user.

    """
    def __init__(self):
        ## url parametesr
        self.share_folder_url = 'https://app.box.com/s/jlwchpjfcpueq1gshij7' #use to go to box to get the image url
        self.box_image_full_url = ''
        self.box_image_start_url = 'https://app.box.com/representation/file_version_'
        self.box_image_end_url =''

        ## local placeholder location.
        self.local_image_store_path = r'C:\Users\Tan Kok Hua\Box Sync\temp\stock2.jpg'
        self.image_version = '0' #current version that exists
        self.image_version_history = '0' # Use to check version or whether file has already uploaded.

        ## general use
        self.dom_object = object()

        ## Error/ debug / monitor
        self.url_query_timeout = 0
        self.new_image_upload_check_cntdn = 10 # number of times before the while loop break for checking.

    def set_box_public_link_of_image(self, image_public_link):
        """ Set the public link of image based on BOX.
            To get the public link. Go to Box Sync folder, navigate to image, right click and select Share Box link.
            Args:
                image_public_link (str): http string of the image public link.
       """
        self.share_folder_url = image_public_link

    def fetch_image_url_fr_box(self):
        """ Fetch Image url for Box.com.
            Set to self.image_url.
            Make use of selenium.

        """
        with closing(Firefox()) as browser:
             browser.get(self.share_folder_url)
             time.sleep(3)
             page_source = browser.page_source

        self.set_box_image_end_url(page_source)
        self.set_final_image_box_url()

    def set_box_image_end_url(self, box_page_source):
        """ From the box page source, get the box_image end url.
            Note the image version number will change with each upload of the same filename.
            Args:
                box_page_source (str): source in html.
            Returns:
                (str): inside file_version_x where x is the digit str required.
        """
        dom = DOM(box_page_source)

        ## pic will be in the img tag. For box only one img tag return
        img_element = dom("img")[0]
        ## text str will be inside this attribute or the img tag --> src.
        ## encode to get rid of the unicode
        txt_str = img_element.attributes['src'].encode()
        ## Get the image version --> mainly to use whether the image is already uploaded.
        self.image_version = re.search('file_version_(.*)/image', txt_str).group(1)
        ## extract the file version from the text str.
        self.box_image_end_url = re.search('file_version_(.*)', txt_str).group(1)

    def set_final_image_box_url(self):
        """ Get final image box url by joining the start and end url.

        """
        self.box_image_full_url = self.box_image_start_url + self.box_image_end_url

    def set_image_version_history(self):
        """ Set the image version history by scanning the website before uploading new image.
        """
        self.fetch_image_url_fr_box() # will also set the image version history
        self.image_version_history = self.image_version
        print 'Image version history', self.image_version_history

    def upload_new_image(self, target_image_path):
        """ Move the target image to the place holder defined by self.local_image_store_path
            Args:
                target_image_path (str): file path of image to be searched.
        """
        print 'uploading images'
        shutil.copy2(target_image_path, self.local_image_store_path)
        if self.has_img_uploaded():
            print 'Successful'
        else:
            print 'new image not found'

    def has_img_uploaded(self):
        """ Checked whether image has uploaded by repeatly calling the image url get.
            if self.image_version_history is changed.

        """
        for n in range(self.new_image_upload_check_cntdn):
            time.sleep(10)
            self.fetch_image_url_fr_box()
            if not self.image_version == self.image_version_history:
                ## means new version already uploaded
                return True
        return False

if __name__ == '__main__':
    choice  = 3

    if choice ==3:
        ## initialize the class
        hh = BoxImageUrl()

        ## Set the image public link from the BOX sync folder
        hh.set_box_public_link_of_image('https://app.box.com/s/jlwchpjfcpueq1gshij7')

        ## Go the public link and get the previous true image url.
        ## As the image file is continuously upload with new image, this is used to check for version.
        hh.set_image_version_history()

        ## Upload the new image to perform the google search.
        ## Time is allocated for the image to upload fully by monitoring the change in file version.
        hh.upload_new_image(r'C:\data\temp\person.jpg')

        ## Latest image url is obtained. This will eventually pass to google for image search.
        print hh.box_image_full_url

Google Search results web crawler (re-visit Part 2)

Added 2 new features to Google search results web crawler. This is continuation of previous work on web crawler with Pattern. The script can be found at GitHub.

The first feature is to return the google search results sorted by date relevance. To turn on the date filter manually in google search, the following url string (“&as_qdr=d“) is appended. The following website provide more information on this. For the script based crawler, the url string to be appended is “&tbs=qdr:d,sbd:1” which will sort the date in descending, i.e, the most current date first.

The 2nd feature is the enable_results_converging options where it will merge all results from a list of keyword search. The merging is such that the top results from each search keyword are grouped together, i.e, it will list all the #1 search together followed by the #2 and so forth.

A sample run of the script is as below. The date filtered is turn off in this case. The example focus on fetching all the news from a particular stock “Sheng Siong” by searching for multiple keywords. It is assumed the most relevant are grouped at the top list hence consolidating all the same ranked results will provide more useful information.

        print 'Start search'

        ## User options
        NUM_SEARCH_RESULTS = 5                # number of search results returned 
        search_words = ['Sheng Siong buy' , 'Sheng Siong sell', 'Sheng Siong sentiment', 'Sheng Siong stocks review', 'Sheng siong stock market']  # set the keyword setting
        ## Create the google search class
        hh = gsearch_url_form_class(search_words)

        ## Set the results
        hh.set_num_of_search_results(NUM_SEARCH_RESULTS)
        #hh.enable_sort_date_descending()# enable sorting of date by descending. --> not enabled

        ## Generate the Url list based on the search item
        url_list =  hh.formed_search_url()

        ## Parse the google page based on the url
        hh.parse_all_search_url()
        hh.consolidated_results()
        
        print 'End Search'

Top 5 Output are displayed as below. The link from google results + the descriptions are printed. Note that there are repeated entry as there are some keywords that return the exact website. Further work is on-going to remove the duplicates.

================
Results

=================

link: http://www.shengsiong.com.sg/
Description:
Sheng Siong
****
link: http://www.shengsiong.com.sg/
Description:
Sheng Siong
****
link: http://www.sharejunction.com/sharejunction/listMessage.htm%3FtopicId%3D10021%26msgbdName%3DSheng%2520Siong%26topicTitle%3DSheng%2520Siong
Description:
ShareJunction – Stock Forum Messages : Sheng Siong
****
link: https://sg.finance.yahoo.com/echarts%3Fs%3DOV8.SI
Description:
Sheng Siong Share Price Chart | OV8.SI – Yahoo! Singapore Finance
****
link: http://sbr.com.sg/source/motley-fool-singapore/here-are-5-things-you-should-know-about-sheng-siong
Description:
Here are 5 things you should know about Sheng Siong | Singapore …
****
link: Sheng+Siong+buy&hq=Sheng+Siong+buy&hnear=0x31da1767b42b8ec9:0x400f7acaedaa420,Singapore
Description:
Local business results for Sheng Siong buy near Singapore
****

Further works include scraping the individual sites for more details much like what is done in the post with Scrapy. The duplicates entries will also be addressed.

Getting Google Search results with python (re-visit)

Below is an alternative to getting Google search results with Scrapy.  As Scrapy installaton on windows as well as the dependencies may pose an issue, this alternative make use of the more lightweight crawler known as Pattern. Unlike the scrapy version, this require only Pattern module as dependency. The script can be found at GitHub.

Similar to the previous Scrapy post, it focus on scraping the links from the Google main page based on the search keyword input. For this script, it will also retrieve the basic description generated by Google. The advantage of this script is that it can search multiple keywords at the same time and return a dict containing all the search key as keys and result links and desc as value. This enable more flexibility in handling the data.

It works in similar fashion to the Scrapy version by first forming the url and use the Pattern DOM object to retrieve the page url and parse the link and desc. The parsing method is based on the CSS selectors provided by the Pattern module.

    def create_dom_object(self):
        """ Create dom object based on element for scraping
            Take into consideration that there might be query problem.

        """
        try:
            url = URL(self.target_url_str)
            self.dom_object = DOM(url.download(cached=True))
        except:
            print 'Problem retrieving data for this url: ', self.target_url_str
            self.url_query_timeout = 1

    def parse_google_results_per_url(self):
        """ Method to google results of one search url.
            Have both the link and desc results.
        """
        self.create_dom_object()
        if self.url_query_timeout: return

        ## process the link and temp desc together
        dom_object = self.tag_element_results(self.dom_object, 'h3[class="r"]')
        for n in dom_object:
            ## Get the result link
            if re.search('q=(.*)&(amp;)?sa',n.content):
                temp_link_data = re.search('q=(.*)&(amp;)?sa',n.content).group(1)
                print temp_link_data
                self.result_links_list_per_keyword.append(temp_link_data)

            else:
                ## skip the description if cannot get the link
                continue

            ## get the desc that comes with the results
            temp_desc = n('a')[0].content
            temp_desc = self.strip_html_tag_off_desc(temp_desc)
            print temp_desc
            self.result_desc_list_per_keyword.append(temp_desc)
            self.result_link_desc_pair_list_per_keyword.append([temp_link_data,temp_desc])
            print

A sample run of the script is as below:

        ## User options
        NUM_SEARCH_RESULTS = 5                # number of search results returned
        search_words = ['tokyo go', 'jogging']  # set the keyword setting

        ## Create the google search class
        hh = gsearch_url_form_class(search_words)

        ## Set the results
        hh.set_num_of_search_results(NUM_SEARCH_RESULTS)

        ## Generate the Url list based on the search item
        url_list =  hh.formed_search_url()

        ## Parse the google page based on the url
        hh.parse_all_search_url()

        print 'End Search'

Output is as below:

================
Results for key: tokyo go

=================
http://www.youtube.com/watch%3Fv%3DwLgSbo0YsN8
Tokyo Go | A Mickey Mouse Cartoon | Disney Shows – YouTube

http://www.gotokyo.org/en/
Home / Official Tokyo Travel Guide GO TOKYO

http://disney.wikia.com/wiki/Tokyo_Go
Tokyo Go – DisneyWiki

http://video.disney.com/watch/disneychannel-tokyo-go-4e09ee61b04d034bc7bcceeb
Tokyo Go | Mickey Mouse and Friends | Disney Video

http://www.imdb.com/title/tt2992228/
"Mickey Mouse" Tokyo Go (TV Episode 2013) – IMDb

================
Results for key: jogging

================
http://en.wikipedia.org/wiki/Jogging
Jogging – Wikipedia, the free encyclopedia

jogging&num=100&client=firefox-a&rls=org.mozilla:en-US:official&channel=fflb&ie=UTF-8&oe=UTF-8&prmd=ivns&source=univ&tbm=nws&tbo=u
News for jogging

jogging&oe=utf-8&client=firefox-a&num=100&rls=org.mozilla:en-US:official&channel=fflb&gfe_rd=cr&hl=en
Images for jogging

http://www.wikihow.com/Start-Jogging
How to Start Jogging: 7 Steps (with Pictures) – wikiHow

http://www.medicinenet.com/running/article.htm
Running: Learn the Facts and Risks of Jogging as Exercise

Scaping google results using python (Updates)

I modified the Google search module described in previous post. The previous limitation of the module to search for more than 100 results is removed.It can now search and process any number of search results defined by the users (also subjected to the number of results returned by Google.)

The second feature include passing the keywords as a list so that it can search more than one search key at a time.

As mentioned in the previous post, I have added a GUI version using wxpython to the script. I will modify the GUI script to take in multiple keywords.

Scaping google results using python (GUI version)

I add a GUI version using wxpython to the script as described in previous post.

The GUI version enable display of individual search results in a GUI format. Each search results can be customized to have the title, link, meta body description, paragraphs on the main page. That is all that is displayed in the current script, I will add in the summarized text in future.

There is also a separate textctrl box for entering any notes based on the results so that user can copy any information to the textctrl box and save it as separate files. The GUI is shown in the picture below.

The GUI script is found in the same Github repository as the google search module. It required one more module which parse the combined results file into separate entity based on the search result number. The module is described in the previous post.

The parsing of the combined results file is very simple by detecting the “###” characters that separate each results and store them individually into a dict. The basic code is as followed.


key_symbol = '###'
combined_result_list,self.page_scroller_result = Extract_specified_txt_fr_files.para_extract(r'c:\data\temp\htmlread_1.txt',key_symbol, overlapping = 0 )

Google Search GUI

Getting Google Search results with python (testing the program)

I was testing out the google search script I created last week. I was searching for the “best hotels to stay in Tokyo”. My objective is to find suitable and popular hotels to stay in Tokyo and within the budget limit.

The python module was created with the intention to display more meaningful and relevant data without clicking to individual websites. However, with just the meta title and meta contents from the search results, it is not really useful in obtaining meaningful results.

I tried to modify the module by extraction of the paragraphs from each site and output them together with the meta descriptions. I make some changes to the script to handle  multiple newline characters and debug on the unicode error that keeps popping out when output the text results.

To extract the paragraphs from each site, I used the xpath command as below.

sel = Selector(response)
paragraph_list = sel.xpath('//p/text()').extract()

To handle the unicode identification error, the following changes are made. The stackoverflow link provides the solution to the problem.

## convert the paragraph list to one continuous string
para_str = self.join_list_of_str(paragraph_list, joined_chars= '..')
## Replace any unknown unicode characters with ?
para_str = para_str.encode(errors='replace')
## Remove newline characters
para_str = self.remove_whitespace_fr_raw(para_str)

With the paragraphs displayed at the output, I was basically reading large chunks of texts and it was certainly messy with the newline removed. I could not really get good information out of it.

For example, it is better to get the ranked hotels from tripadvisor site but from the google search module, tripadvisor only displays the top page without any hotels listed. Below is the output I get from TripAdvisor site pertaining to the search result.

Tokyo Hotels: Check Out 653 hotels with 77,018 Reviews – TripAdvisor
ttp://www.tripadvisor.com.sg/Hotels-g298184-Tokyo_Tokyo_Prefecture_Kanto-Hotels.html

Tokyo Hotels: Find 77,018 traveller reviews and 2,802 candid photos for 653 hotels in Tokyo, Japan on TripAdvisor.

Price per night..Property type..Neighbourhood..Traveller rating..Hotel class..Amenities..Property name..Hotel brand

Performing recursive crawling on TripAdvisor itself perhaps will achieve more meaningful results.

Currently, I do not have much idea on enhancing the script to extract more meaningful data. Perhaps I can use text processing to summarize the paragraphs into meaningful data which would be the next step, utilizing the NLTK module. However, I am not hopeful of the final results.

For this particular search query, perhaps it would be easier to cater specific crawling methods on several target website such as TripAdvisor, Agoda etc rather than a general extraction of text.

Getting Google Search results with Scrapy (2nd Part)

This is the follow up of the Getting Google Search results with Scrapy. In this post, the initial python script for scraping the google search results is completed. The completed script are found in the github.

The program, as described in part 1, obtained the results links from google main page and each links are run separately using Scrapy. In this way, users have more flexibility in obtaining various information from individual websites. At present, only the title and meta contents are scrapped from each website. The other advantage is that is remove further dependency from Google html tag changes.

The disadvantages are that the time taken are relatively longer and descriptions are different from Google’s short summary. I still trying to figure out how to make the contents more meaningful. The present meta content tags are mostly missing for various websites and the contents are not representative of the text.

Dependency of script are Scrapy and yaml (for unicode handling). Both can be downloaded using PIP.

Scripts is divided into 2 parts. The main script for running is from Python_Google_Search.py. The get_google_link_results.py is the scrapy spider for crawling either the google search page or individual websites. The switch depends on the json setting file created.

The spider (get_google_link_results.py) module is a simple script that first get the information from the setting Json file and determine the type of parsing to handle. If the selection is google search links, it will use the following xpath commands to retrieve the all the result links.

sel = Selector(response)
## extract a list of website link related to the search
google_search_links_list = sel.xpath('//h3/a/@href').extract()
google_search_links_list = [re.search('q=(.*)&sa',n).group(1) for n in google_search_links_list\
                            if re.search('q=(.*)&sa',n)]

If it is parsing all the individual results links, it will use the following xpath contents to scrape the meta information

title = sel.xpath('//title/text()').extract()
if len(title)>0: title = title[0]
contents = sel.xpath('/html/head/meta[@name="description"]/@content').extract()
if len(contents)>0: contents = contents[0]

Example of output obtained by searching “Hello Pandas”.  This first 7 results are as below.

####### Google results #####################
Hello Panda – Wikipedia, the free encyclopedia
//en.wikipedia.org/wiki/Hello_Panda
[]
####################
Meiji
//www.meiji.com.au/hellopanda.html
[]
####################
Meiji Hello Panda Chocolate Biscuit, 9.01 Ounce: Amazon.com: Grocery & Gourmet Food
//www.amazon.com/Meiji-Hello-Panda-Chocolate-Biscuit/dp/B000H2DZS0

For the best selection anywhere shop Amazon Grocery for all of your pantry needs. Use Subscribe and Save to save an additional 5% on your regular groceries with free-automatic delivery.
####################
Calories in Meiji – Hello Panda Biscuits, with Choco Cream | Nutrition and Health Facts
//caloriecount.about.com/calories-meiji-hello-panda-biscuits-i170737

Curious about how many calories are in Hello Panda Biscuits? Get nutrition information and sign up for a free online diet program at CalorieCount.
####################
Buy Meiji Hello Panda Creamy Chocolate Filled Biscuits at Tofu Cute
//www.tofucute.com/meiji-hello-panda-biscuits-chocolate~p42.html
[]
###################
Japanese Snack Reviews: Meiji “Hello Panda” Cookies (Chocolate)
//japanesesnackreviews.blogspot.sg/2012/10/meiji-hello-panda-cookies-chocolate.html
[]
####################### Results End ##################

The script is still in infant stage. There is a lot of work under construction. The first will be to obtain more meaningful summary from each website. At present, I am thinking of using NLTK but have not really firmed out any solid approach. Any suggestions are greatly appreciated.