NumPy String: numpy.char.lower() function

numpy.char.lower() function

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

This function is useful in data preprocessing, text analysis etc.

Syntax:

numpy.char.lower(a)

Parameter:

Return value:

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

Example: Converting elements of a string array to lowercase using NumPy

>>> 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')

In the above code a one-dimensional NumPy array x is created with three string elements: 'A1B C', '1BCA', and 'BCA1'. The variable x is then printed, showing the array with a data type of '<U5', which represents a Unicode string with a maximum length of 5 characters.
Then the numpy.char.lower() function is called with the input array x. This function returns a new array with the same shape as the input array, where each element is a lowercase version of the corresponding element in the input array.

Pictorial Presentation:

Python - NumPy Code Editor:

Previous: ljust()
Next: lstrip()