numpy.core.defchararray.chararray.swapcase
method
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chararray.swapcase()[source]
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For each element in self, return a copy of the string with uppercase characters converted to lowercase and vice versa.See also char.swapcase
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Licensed under the 3-clause BSD License.
    https://docs.scipy.org/doc/numpy-1.16.1/reference/generated/numpy.core.defchararray.chararray.swapcase.html