numpy.core.defchararray.lower

numpy.core.defchararray.lower(a)[源代码]

Return an array with the elements converted to lowercase.

Call str.lower element-wise.

For 8-bit strings, this method is locale-dependent.

Parameters:
a : array_like, {str, unicode}

Input array.

Returns:
out : ndarray, {str, unicode}

Output array of str or unicode, depending on input type

参见

str.lower

Examples

>>> c = np.array(['A1B C', '1BCA', 'BCA1']); c
array(['A1B C', '1BCA', 'BCA1'],
      dtype='|S5')
>>> np.char.lower(c)
array(['a1b c', '1bca', 'bca1'],
      dtype='|S5')