char.
lower
Return an array with the elements converted to lowercase.
Call str.lower element-wise.
str.lower
For 8-bit strings, this method is locale-dependent.
Input array.
Output array of str or unicode, depending on input type
See also
Examples
>>> c = np.array(['A1B C', '1BCA', 'BCA1']); c array(['A1B C', '1BCA', 'BCA1'], dtype='<U5') >>> np.char.lower(c) array(['a1b c', '1bca', 'bca1'], dtype='<U5')