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numpy.ndarray.std
method
- ndarray.std(axis=None, dtype=None, out=None, ddof=0, keepdims=False)
- 
    Returns the standard deviation of the array elements along given axis. Refer to numpy.stdfor full documentation.See also - numpy.std
- 
       equivalent function 
 
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 https://numpy.org/doc/1.19/reference/generated/numpy.ndarray.std.html