numpy.core.defchararray.replace
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numpy.core.defchararray.replace(a, old, new, count=None)[source]
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For each element in a, return a copy of the string with all occurrences of substringoldreplaced bynew.Calls str.replaceelement-wise.Parameters: a : array-like of str or unicode old, new : str or unicode count : int, optional If the optional argument countis given, only the firstcountoccurrences are replaced.Returns: out : ndarray Output array of str or unicode, depending on input type See also 
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    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.core.defchararray.replace.html