[python] How to convert upper case letters to lower case

I have a script which reads the input and than lists it, however i want it to convert upper case letters to lower case, how can i do that?

this is what i got

 for words in text.readlines():
    sentence = [w.strip(',.') for w in line.split() if w.strip(',.')]
    list.append(sentence)

str.lower() converts all cased characters to lowercase.

To convert a string to lower case in Python, use something like this.

list.append(sentence.lower())

I found this in the first result after searching for "python upper to lower case".

You can find more methods and functions related to Python strings in section 5.6.1. String Methods of the documentation.

w.strip(',.').lower()