numpy.core.defchararray.chararray.replace
method
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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
    © 2005–2019 NumPy Developers
Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.core.defchararray.chararray.replace.html