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Hack 98. Program Google in Python

Programming the Google Web API with Python is simple and clean, as these scripts and interactive examples demonstrate.

Programming to the Google Web API from Python is a piece of cake, thanks to Mark Pilgrim's PyGoogle wrapper module (http://pygoogle.sourceforge.net/)Śnow maintained by Brian Landers. PyGoogle abstracts away much of the underlying SOAP, XML, and request/response layers, leaving you free to spend your time with the data itself.

9.15.1. PyGoogle Installation

Download a copy of PyGoogle (http://sourceforge.net/project/showfiles.php?group_id=99616) and follow the installation instructions (http://pygoogle.sourceforge.net/dist/readme.txt). Assuming all goes to plan, this should be nothing more complex than:

% python setup.py install

Alternatively, if you want to give this a whirl without installing PyGoogle or don't have permissions to install it globally on your system, simply put the included SOAP.py and google.py files into the same directory as the googly.py script itself.

9.15.2. The Code

Save this code to a text file called googly.py. Be sure to replace insert key here with your own Google API key.

#!/usr/bin/python

# googly.py

# A typical Google Web API Python script using Mark Pilgrim's

# PyGoogle Google Web API wrapper

# [http://diveintomark.org/projects/pygoogle/].

# Usage: python googly.py <query>

     

import sys, string, codecs

     

# Use the PyGoogle module.

import google

     

# Grab the query from the command line

if sys.argv[1:]:

  query = sys.argv[1]

else:

  sys.exit('Usage: python googly.py <query>')

     

# Your Google API developer's key.

google.LICENSE_KEY = 'insert key here'

     

# Query Google.

data = google.doGoogleSearch(query)

     

# Teach standard output to deal with utf-8 encoding in the results.

sys.stdout = codecs.lookup('utf-8')[-1](sys.stdout)

     

# Output.

for result in data.results:

  print string.join( (result.title, result.URL, result.snippet), "\n"), "\n"

9.15.3. Running the Hack

Invoke the script on the command line ["How to Run the Hacks" in the Preface] as follows:

% python googly.py

 "query words"

9.15.4. The Results

Here's a sample run, searching for "learning python":

% python googly.py "learning python"

oreilly.com -- Online Catalog: <b>Learning</b> 

<b>Python</b>

http://www.oreilly.com/catalog/lpython/

<b>Learning</b> <b>Python</b> is an 

introduction to the increasingly popular interpreted programming

language that's portable, powerful, and remarkably easy to use in both 

<b>...</b>   

...

Book Review: <b>Learning</b> <b>Python</b>

http://www2.linuxjournal.com/lj-issues/issue66/3541.html

<b>...</b> Issue 66: Book Review: <b>Learning</b> 

<b>Python</b> <b>...</b> Enter 

<b>Learning</b> <b>Python</b>. My executive summary 

is that this is the right book for me and probably for many others 

as well. <b>...</b>

9.15.5. Hacking the Hack

Python has a marvelous interface for working interactively with the interpreter. It's a good place to experiment with modules such as PyGoogle, querying the Google API on the fly and digging through the data structures it returns.

Here's a sample interactive PyGoogle session demonstrating the use of the doGoogleSearch, doGetCachedPage, and doSpellingSuggestion functions:

% python

Python 2.2 (#1, 07/14/02, 23:25:09) 

[GCC Apple cpp-precomp 6.14] on darwin

Type "help", "copyright", "credits" or "license" for more information.

>>> import google

>>> google.LICENSE_KEY = '

insert key here

'

>>> data = google.doGoogleSearch("Learning Python")

>>> dir(data.meta)

['_  _doc_  _', '_  _init_  _', '_  _module_  _', 'directoryCategories', 

'documentFiltering', 'endIndex', 'estimateIsExact', 

'estimatedTotalResultsCount', 'searchComments', 'searchQuery', 

'searchTime', 'searchTips', 'startIndex']

>>> data.meta.estimatedTotalResultsCount

115000

>>> data.meta.directoryCategories

[{u'specialEncoding': '', u'fullViewableName': "Top/Business/Industries/

Publishing/Publishers/Nonfiction/Business/O'Reilly_and_Associates/

Technical_Books/Python"}]

>>> dir(data.results[5])

['URL', '_  _doc_  _', '_  _init_  _', '_  _module_  _', 'cachedSize', 

'directoryCategory', 'directoryTitle', 'hostName', 

'relatedInformationPresent', 'snippet', 'summary', 'title']

>>> data.results[0].title

'oreilly.com -- Online Catalog: <b>Learning</b> <b>Python'

>>> data.results[0].URL

'http://www.oreilly.com/catalog/lpython/'

>>> google.doGetCachedPage(data.results[0].URL)

'<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1">\n

<BASE HREF="http://www.oreilly.com/catalog/lpython/"><table border=1

...

>>> google.doSpellingSuggestion('lurn piethon'

)



'learn python'

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