change values in a list - python

Posted by ariel on Stack Overflow See other posts from Stack Overflow or by ariel
Published on 2010-05-12T17:41:05Z Indexed on 2010/05/12 17:54 UTC
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I have this code:

a=[['a','b','c'],['a','f','c'],['a','c','d']]    
for x in a:    
    for y in x:    
        if 'a' in x:    
            x.replace('a','*')`  

but the result is:

a=[['a','b','c'],['a','f','c'],['a','c','d']]

and bot a=[['b','c'],['f','c'],['c','d']]

What should I do so the changes will last?

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