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Letter frequency function using lists

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masterofpuppets masterofpuppets is offline

Offline Oct 19th, 2009, 9:39 pm |

A simple function to return the number of occurances of a letter in a text. An easier way to implement this would be by using a dictionary

P.S sorry if there already is a code snipped like that somewhere.

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Code Snippet

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def letterFrequency():
 
    newString = raw_input( "Type the string here: " )
 
    #Convert to lowercase
    mod_string = newString.lower()
 
    #Initialize lists to store the new data in
    data = []
    new_data = []
    count = 0
 
    #Check only for characters in the given string
    for s in 'abcdefghijklmnopqrstuvwxyz':
        count = 0
        for char in mod_string:        
            if s == char:
                count += 1
 
        data = [ s, count ]
        new_data += [ data ]    
 
    return new_data
 
print letterFrequency()

Code Snippet Comments

bumsfeld

Offline | Oct 20th, 2009

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You may not want to add letters to the list that have zero count.

masterofpuppets masterofpuppets is offline

Offline | Oct 20th, 2009

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yeah you're right a quick fix would be to add an if statement in line 19, like

 Help with Code Tags 
 Python Syntax (Toggle Plain Text) 
if count > 0:
   data = [ s, count ]
   new_data += [ data ]
if count > 0:
   data = [ s, count ]
   new_data += [ data ]