Appending / concatenating one string to elements of a list of strings (Python 3.5)

Question

Perhaps this has been answered, but I sincerely could not find it.

I wish to have a specific output in the form of:

("A_1", "A_2", ..., "A_100")

I tried:

a = "A_"
nums_1_100 = str(list(range(1,101)))
for i in range (1,101):
    x = a
    x += nums_1_100

And this returns:

'A_[1, 2, 3, 4, 5, ..., 100]'

Using map print(list(map(lambda x: 'A_%d' % x, range(1, 101)))) — user459872
– user459872, Commented Mar 25, 2018 at 15:45

Marcin Orlowski · Accepted Answer · 2018-03-25 17:51:18Z

2

Your code makes no sense as you overwrite x each iteration, which in result kills what your code produced in previous one. You want rather to use simple list comprehension instead:

result = [ 'A_%d' % i for i in range(1,101)]

which would then produce list with elements like A_1, A_2 ...

edited Mar 25, 2018 at 17:51

answered Mar 25, 2018 at 15:39

Marcin Orlowski

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1 Comment

sven Over a year ago

Thanks :) I suppose I could've known it didn't make sense, and thanks for the answer!

Stephen Rauch · Accepted Answer · 2018-03-25 15:39:55Z

0

Try a list comprehension to make that list of strings like:

x = ['A_{}'.format(i) for i in range(1, 101)]

answered Mar 25, 2018 at 15:39

Stephen Rauch♦

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Comments

theJoestJoeToEverJoe · Accepted Answer · 2018-03-25 15:56:16Z

0

Here is the functional approach. This will work with a list of any type, so if you decided to switch from ints at the end to strings/characters, all that would need to change would be the contents of listToAppend.

listToAppend = list(range(1, 101))
output = list(map(lambda x: "A_" + str(x), listToAppend))

answered Mar 25, 2018 at 15:56

theJoestJoeToEverJoe

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1 Comment

Marcin Orlowski Over a year ago

I am afraid that this is the type of approach we call "over-engeneering". As result, you will end up with the code that is universal for no real benefits, hard to understand and complicated for every single simple task.

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