How to add a character to the end of every string in a list?

list = [item + ':' for item in list]

In a list of

['word1', 'word2', 'word3']

This will result in

['word1:', 'word2:', 'word3:']

You can read more about them here.

https://docs.python.org/2/tutorial/datastructures.html#list-comprehensions

You can use a list comprehension as others have suggesed. You can also use this code:

newlist = map(lambda x: x+':', list)

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