How to do case-insensitive search in a Python list

Question

I want to search a string in a list of strings. The strings in the list may be in upper or lower case. How can I do case-insensitive search?

E.g.

aa=['hello','How','Are','you']

If I search 'Hello' or 'HELLO' in the list, it should return True.

Answer 1

To do a case-insensitive search, you need to convert your target string and strings in the list to either lowercase or uppercase.

Here is an example:

>>> aa=['hello','How','Are','you']
>>> 'Are'.lower() in [i.lower() for i in aa]
True
>>> 'How'.lower() in [i.lower() for i in aa]
True
>>> 'hoW'.lower() in [i.lower() for i in aa]
True
>>> 'HeLLo'.lower() in [i.lower() for i in aa]
True