str.
lower
Convert strings in the Series/Index to all lowercase.
Examples
>>> s = ps.Series(['lower', 'CAPITALS', 'this is a sentence', 'SwApCaSe']) >>> s 0 lower 1 CAPITALS 2 this is a sentence 3 SwApCaSe dtype: object
>>> s.str.lower() 0 lower 1 capitals 2 this is a sentence 3 swapcase dtype: object