extract a substring from an array of strings in python

Question

Is there a way how to extract an array (or list) of substrings (all characters from position 1 to position 2) from all elements of a string array (or a list of strings) without making a loop?

For example, I have: aa=['ab1cd','ab2ef'] , and I want my output to be: out=['b1','b2']

For a single string variable I would do out=aa[1:3], but I can't figure how to do it for a list or array (without a loop).

Sven Marnach · Accepted Answer · 2011-04-11 16:37:43Z

17

You will definitely need some kind of loop. A list comprehension is the easiest way:

out = [x[1:3] for x in aa]

answered Apr 11, 2011 at 16:37

Sven Marnach

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2 Comments

Andrew Clark Over a year ago

An alternative is map(lambda x: x[1:3], aa)

boef Over a year ago

Thanks, you spared me a lot of time trying to figure it out! I usually work with IDL, and there most functions (including most string functions) can take an array as an argument. I assumed it is the same in Python, and I assumed wrong. Thanks again.

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