What is spell checking? 

In computing, a spell checker (or spell check) is an application program that flags words in a document that may not be spelled correctly. Spell checkers may be stand-alone, capable of operating on a block of text, or as part of a larger application, such as a word processor, email client, electronic dictionary, or search engine.

1. using the popen2 module in python to call the commandlines



Spell4Py is a Wrapper for Hunspell library. Org.keyphrene has been 
splited to several simple projects.
There is a tutorial for Hunspell here: 

2. using a pure python program.

This page provides a very simple pure python spell checking program.
You can train it with a dictionary or a textual corpus off-the-shelf with
an accuracy around 70%. 
I also deploy an application online, click here as an example.  You can also try other words for testing. 

3. Google API




import httplibimport xml.dom.minidom

data = """
0" ignoredups="0" ignoredigits="1" ignoreallcaps="1">
 %s 

"""
def spellCheck(word_to_spell):

    con 
= httplib.HTTPSConnection("www.google.com")
    con
.request("POST", "/tbproxy/spell?lang=en", data % word_to_spell)
    response 
= con.getresponse()

    dom 
= xml.dom.minidom.parseString(response.read())
    dom_data 
= dom.getElementsByTagName('spellresult')[0]

    
if dom_data.childNodes:
        
for child_node in dom_data.childNodes:
            result 
= child_node.firstChild.data.split()
        
for word in result:
            
if word_to_spell.upper() == word.upper():
                
return True;
        
return False;
    
else:
        
return True;

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