Return element-wise string concatenation for two arrays of str or unicode.
Arrays x1 and x2 must have the same shape.
x1 : array_like of str or unicode
Input array.
x2 : array_like of str or unicode
add : ndarray
Output array of string_ or unicode_, depending on input types of the same shape as x1 and x2.
numpy.core.defchararray.chararray.zfill
numpy.core.defchararray.multiply
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