Changing python immutable type while iterating through a mutable container such as list

I am wondering what is the most pythonic way to do the following and have it work:

strings = ['a','b']

for s in strings:  
    s = s+'c'

obviously this doesn't work in python but the result that I want to acheive is

strings = ['ac','bc']

Whats the most pythonic way to achieve this kind of result?

Than开发者_C百科ks for the great answers!

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strings = ['a', 'b']
strings = [s + 'c' for s in strings]

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You can use list comprehension to create a list that has these values: [s + 'c' for s in strings]. You can modify the list in-place like this:

for i, s in enumerate(strings):
    strings[i] = s + 'c'

But I found that quite often, in-place modification is not needed. Look at your code to see if this applies.

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You can use map function for that.

strings = ['a', 'b']
strings = map(lambda s: s + 'c', strings)