numpy.core.defchararray.chararray.replace
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chararray.replace(old, new, count=None)[source]
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For each element in self, return a copy of the string with all occurrences of substringoldreplaced bynew.See also char.replace
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Licensed under the NumPy License.
    https://docs.scipy.org/doc/numpy-1.11.0/reference/generated/numpy.core.defchararray.chararray.replace.html