np logical not

np.logical_not(3)
False
&gt;&gt;&gt; np.logical_not([True, False, 0, 1])
array([False,  True,  True, False])

a = np.array([True, False])
&gt;&gt;&gt; b = np.array([False, False])
&gt;&gt;&gt; a &amp; b
array([False, False])

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