How to truncate all strings in a list to a same length, in some pythonic way?

Question

Let\'s say we have a list such as:

g = [\"123456789123456789123456\", 
     \"1234567894678945678978998879879898798797\", 
     \"654654656465656565656565565         


        

Answer 1

Use a list comprehension:

[elem[:12] for elem in g]

Answer 2

Another option is to use map(...) :

b = map(lambda x: x[:9],g)

Answer 3

Use a list comprehension:

g2 = [elem[:12] for elem in g]

If you prefer to edit g in-place, use the slice assignment syntax with a generator expression:

g[:] = (elem[:12] for elem in g)

Demo:

>>> g = ['abc', 'defg', 'lolololol']
>>> g[:] = (elem[:2] for elem in g)
>>> g
['ab', 'de', 'lo']