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Python List Comprehension

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Ok, been wanting to write about this for a while, in case i forgot, but seems like I almost forgot about it. It’s about a a feature of Python that I don’t really see in other languages i use such as C#, so I wanted to write about this in case i forgot.

Ok, so the list comprehension is a python feature that, as the name suggest, create a new list based on an existing list. Well, I think it’s much easier for me to just write an example, this post is meant for myself anyway.

#basically, to use list comprehension, surround the expression in square brackets
aList = [1,2,3,4,5,6]

# create a new list of even numbers, the conditional operation is optional though.
evens  = [x for x in aList if x%2==0]

This entry is posted in 2012.

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