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numpy.char.chararray.nonzero
method
- chararray.nonzero()
- 
    Return the indices of the elements that are non-zero. Refer to numpy.nonzerofor full documentation.See also - numpy.nonzero
- 
       equivalent function 
 
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 https://numpy.org/doc/1.19/reference/generated/numpy.char.chararray.nonzero.html