capitalize a list in python code example

Example 1: how to lowercase list in python

[x.lower() for x in ["A","B","C"]]
['a', 'b', 'c']

>>> [x.upper() for x in ["a","b","c"]]
['A', 'B', 'C']

>>> map(lambda x:x.lower(),["A","B","C"])
['a', 'b', 'c']
>>> map(lambda x:x.upper(),["a","b","c"])
['A', 'B', 'C']

Example 2: how to make a list copy in python with lowercase check

current_users_lower = []
for user in current_users:
    current_users_lower.append(user.lower())