Remove the part with a character and numbers connected together in a string

Question

How to remove the part with "_" and numbers connected together in a string using Python?

For example,

Input: ['apple_3428','red_458','D30','green']

Excepted output: ['apple','red','D30','green']

Thanks!

My samples don't contain such cases so I don't consider for these two cases you mentioned. For sure it would be better if they can be considered. In this case the output for them should be ['green_','greenaaa']. In other words, remove the part where "_" and numbers both connected together. :) — Leo, Jul 20 '21 at 11:48

score 2 · Answer 1 · answered Jul 20 '21 at 11:42

2

This should work:

my_list = ['apple_3428','red_458','D30','green']
new_list = []
for el in my_list:
    new_list.append(el.split('_')[0])

new_list will be ['apple', 'red', 'D30', 'green'].

Basically you split every element of my_list (which are supposed to be strings) and then you take the first, i.e. the part before the _. If _ is not present, the string will not be split.

answered Jul 20 '21 at 11:42

SilentCloud

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While this works for the provided input, it does not answer the question. – user2390182 Jul 20 '21 at 11:45

score 2 · Answer 2 · answered Jul 20 '21 at 11:43

2

Using regular expressions with re.sub:

import re

[re.sub("_\d+$", "", x) for x in ['apple_3428','red_458','D30','green']]
# ['apple_3428','red_458','D30','green']

This will strip an underscore followed by only digits from the end of a string.

answered Jul 20 '21 at 11:43

user2390182

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score 1 · Answer 3 · answered Jul 20 '21 at 11:43

1

Try this:

output_list = [x.split('_')[0] for x in input_list]

answered Jul 20 '21 at 11:43

Riccardo Bucco

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eroot163pi · Accepted Answer · 2021-07-20T11:59:26.937

I am not sure which is needed, so present few options

Also list comp is better instead of map + lambda, also list comp is more pythonic, List comprehension vs map

\d+ stand for atleast one digit
\d* stand for >= 0 digit

>>> import re
>>> list(map(lambda x: re.sub('_\d+$', '', x), ['green_', 'green_458aaa']))
['green', 'greenaaa']
>>> list(map(lambda x: re.sub('_\d*', '', x), ['green_', 'green_458aaa']))
['green', 'greenaaa']
>>> list(map(lambda x: re.sub('_\d+', '', x), ['green_', 'green_458aaa']))
['green_', 'greenaaa']
>>> list(map(lambda x: x.split('_', 1)[0], ['green_', 'green_458aaa']))
['green', 'green']

score 0 · Answer 5 · answered Jul 20 '21 at 11:45

0

input_list = ['apple_3428','red_458','D30','green']
output_list = []

for i in input_list:
    output_list.append(i.split('_', 1)[0])

You can simply split the string.

answered Jul 20 '21 at 11:45

CozyCode

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Remove the part with a character and numbers connected together in a string

5 Answers5