Defined in awkward.operations.str.akstr_lower on line 12.

ak.str.lower(array, *, highlevel=True, behavior=None)#

Replaces any string-valued data with a lowercase version (correctly transforming Unicode characters).

Replaces any bytestring-valued data with a lowercase version (transforming ASCII characters only).

Note: this function does not raise an error if the array does not contain any string or bytestring data.

Requires the pyarrow library and calls pyarrow.compute.utf8_lower or pyarrow.compute.ascii_lower on strings and bytestrings, respectively.