Convert All Items in a Python List to Lower Case

Here are 2 ways to convert all items in a list to a lower case:

(1) Using a List Comprehension:

my_list = ["AA", "BB", "CC", "DD", "EE"]
lower_case_list = [i.lower() for i in my_list]

print(lower_case_list)

The result:

['aa', 'bb', 'cc', 'dd', 'ee']

(2) Using a For Loop:

my_list = ["AA", "BB", "CC", "DD", "EE"]

lower_case_list = []

for i in my_list:
    lower_case_list.append(i.lower())

print(lower_case_list)

The result:

['aa', 'bb', 'cc', 'dd', 'ee']

Alternatively, you may use the following generator to convert all the items in your list to a lower case:

For example:

You can view the following guide to learn how to convert all items in a list to upper case.