Lowercase a list of lists

Question

I have a list of lists:

data = [['SiteUrl','Url','Title'],['SiteUrl','Url','Title']]

How can I iterate through the list and lowercase all the content using python?

Answer 1

Using a list comprehension:

data = [[x.casefold() for x in sublst] for sublst in data]

Or functionally:

data = [list(map(str.casefold, x)) for x in data]

From the docs:

Casefolding is similar to lowercasing but more aggressive because it is intended to remove all case distinctions in a string.