[Python] Is there an inverted version of numpy.all()?

As stated in the docs for numpy.all():

numpy.all() tests whether all array elements along a given axis evaluate to True.
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Is there a function, that does the opposite: Check whether all array elements along a given axis (I need the diagonal) evaluates to False.

What I need in particular is to check if the diagonal of a 2-dimensional matrix is zero every where.

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