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numpy.char.join

numpy.char.join(sep, seq)

Return a string which is the concatenation of the strings in the sequence seq.

Calls str.join element-wise.

Parameters:
sep : array_like of str or unicode
seq : array_like of str or unicode
Returns:
out : ndarray

Output array of str or unicode, depending on input types

See also

str.join

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