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david-cortes opened this issue Sep 1, 2019 · 1 comment
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Converting char to bool fails when it encounters false #14406

david-cortes opened this issue Sep 1, 2019 · 1 comment
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@david-cortes
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If I initialize a numpy array of C char and try to convert it to numpy booleans, it throws an error whenever it encounters a zero (false).

import numpy as np, ctypes
np.zeros(5, dtype = ctypes.c_char).astype("bool")
---------------------------------------------------------------------------
ValueError                                Traceback (most recent call last)
<ipython-input-11-284bcf3dfeb8> in <module>
      1 import numpy as np, ctypes
----> 2 np.zeros(5, dtype = ctypes.c_char).astype("bool")

ValueError: invalid literal for int() with base 10: ''
@seberg
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seberg commented Sep 3, 2019

Hmmm, this is a bit strange. Probably some very old behaviour. You are right, empty strings should be interpreted as False, the problem will be that changing may be tricky with backwards compatibility

In any case, I will close this for discussion to conginue in gh-9875 which is much more comprehensive.

@seberg seberg closed this as completed Sep 3, 2019
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