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numpy.char.add

numpy.char.add(x1, x2)

Return element-wise string concatenation for two arrays of str or unicode.

Arrays x1 and x2 must have the same shape.

Parameters:
x1 : array_like of str or unicode

Input array.

x2 : array_like of str or unicode

Input array.

Returns:
add : ndarray

Output array of string_ or unicode_, depending on input types of the same shape as x1 and x2.

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https://docs.scipy.org/doc/numpy-1.17.0/reference/generated/numpy.char.add.html