numpy.char.chararray.isupper
method
- 
chararray.isupper(self) - 
Returns true for each element if all cased characters in the string are uppercase and there is at least one character, false otherwise.
See also
char.isupper 
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Licensed under the 3-clause BSD License.
    https://numpy.org/doc/1.18/reference/generated/numpy.char.chararray.isupper.html