Replace two values in a list using list comprehension?

Question

I have thw following list:

list1 = ["cmd_%Y","cmd_%y","cmd_other"]

I need to replace "%y" and "%Y" (uppercase and lowercase) using list comprehensions, I tried just for one substr:

list1 = [ cmd.replace('%Y', "some_val_forY") for cmd in list1 ]

And obviously I'm discarding non-pythonic way to solve this issue.

How can I modify my solution to acept both criteria and get:

list1 = [ "cmd_some_val_for_Y","cmd_some_val_for_y", "cmd_other" ]

So you want to get the first Y in uppercase?

Dani Mesejo
– Dani Mesejo

2019-10-08 19:22:23 +00:00
Commented Oct 8, 2019 at 19:22 — Dani Mesejo
– Dani Mesejo, Commented Oct 8, 2019 at 19:22

RomanPerekhrest · Accepted Answer · 2019-10-08 19:50:36Z

1

In most simple case - with chained replacement:

list1 = ["cmd_%Y","cmd_%y","cmd_other"]
list1 = [cmd.replace('%Y', "some_val_Y").replace('%y', "some_val_y") for cmd in list1]
print(list1)   # ['cmd_some_val_Y', 'cmd_some_val_y', 'cmd_other']

Otherwise, use regex substitution:

import re

list1 = ["cmd_%Y","cmd_%y","cmd_other"]
pat = re.compile(r'%y', re.I)
list1 = [pat.sub(lambda m: 'some_val_y' if m.group() == '%y' else 'some_val_Y', cmd) 
         for cmd in list1]

print(list1)   # ['cmd_some_val_Y', 'cmd_some_val_y', 'cmd_other']

edited Oct 8, 2019 at 19:50

answered Oct 8, 2019 at 19:20

RomanPerekhrest

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