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numpy.ndarray.diagonal
method
- ndarray.diagonal(offset=0, axis1=0, axis2=1)
- 
    Return specified diagonals. In NumPy 1.9 the returned array is a read-only view instead of a copy as in previous NumPy versions. In a future version the read-only restriction will be removed. Refer to numpy.diagonalfor full documentation.See also - numpy.diagonal
- 
       equivalent function 
 
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 https://numpy.org/doc/1.19/reference/generated/numpy.ndarray.diagonal.html