NumPy: lower() function

numpy.core.defchararray.lower() function

The numpy.core.defchararray.lower() function returns an array with the elements converted to lowercase.

Version: 1.15.0

Syntax:

numpy.core.defchararray.lower(a)

Parameter:

Return value:

out : ndarray, {str, unicode} - Output array of str or unicode, depending on input type.

Note:

The 'chararray' class exists for backwards compatibility with Numarray, it is not recommended for new development. Starting from numpy 1.4, if one needs arrays of strings, it is recommended to use arrays of 'dtype' 'object_', 'string_' or 'unicode_', and use the free functions in the 'numpy.char' module for fast vectorized string operations.

Some methods will only be available if the corresponding string method is available in your version of Python.

The preferred alias for 'defchararray' is 'numpy.char'.

Example: numpy.lower() function

>>> import numpy as np
>>> x = np.array(['A1B C', '1BCA', 'BCA1']); x
array(['A1B C', '1BCA', 'BCA1'], dtype='<U5')
>>> np.char.lower(x)
array(['a1b c', '1bca', 'bca1'], dtype='*lt;U5')

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