`numpy.strings:mod`

Signature

def mod ( a , values )

Return (a % i), that is pre-Python 2.6 string formatting (interpolation), element-wise for a pair of array_likes of str or unicode.

a : array_like, with `np.bytes_` or `np.str_` dtype
values : array_like of values: These values will be element-wise interpolated into the string.

out : ndarray: Output array of StringDType, bytes_ or str_ dtype, depending on input types

import numpy as np
a = np.array(["NumPy is a %s library"])
np.strings.mod(a, values=["Python"])

✓

a = np.array([b'%d bytes', b'%d bits'])
values = np.array([8, 64])
np.strings.mod(a, values)

✓