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BUG: bool(scalar) is not the same as scalar.astype(bool) #9847
Description
At least, with the void type:
>>> v1 = np.array(b'', (np.void,1))[()]
>>> v2 = np.array(b'', (np.void,2))[()]
>>> bool(v1), bool(v2)
(False, False) # reasonable, meaning all null
>>> v1.astype(bool)
False # ok
>>> v1.astype(bool)
ValueError: setting an array element with a sequence. # uh ohAnd the string type:
>>> s = np.array('0')[()]
>>> bool(s)
True
>>> s.astype(bool)
False # actually bool(int(s))
Activity
eric-wieser commentedon Oct 17, 2017
Now that void scalars are fixed, closing in favor of #9875, which is a better summary of the can of worms which strings are.
BUG: Make bool(void_scalar) and void_scalar.astype(bool) consistent
PERF: avoid array scalars in the string-like casts
PERF: avoid array scalars in the string-like casts
PERF: speed up the fixed-width string casts and unicode scalars