numpy.char.chararray.swapcase
method
- 
char.chararray.swapcase()[source] - 
For each element in
self, return a copy of the string with uppercase characters converted to lowercase and vice versa.See also
 
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Licensed under the 3-clause BSD License.
    https://numpy.org/doc/1.21/reference/generated/numpy.char.chararray.swapcase.html