Conversion to Boolean with fractions.Fraction and numpy integers

When defining a Fraction based on a numpy array of integers, the numerator is a numpy integer, which causes problems when converting to bool.

Reproducing code example:

import numpy as np
from fractions import Fraction
numerators = np.array([4, 3])
my_fraction = Fraction(numerators[0], 100)
print(repr(my_fraction))
print(bool(my_fraction))

In this example my_fraction is represented as Fraction(4, 100), and one would expect that it converts to True; but it raises an error instead.

Error message:

Traceback (most recent call last): File “main.py”, line 6, in <module> print(bool(my_fraction)) TypeError: bool should return bool, returned numpy.bool_

Numpy/Python version information:

Numpy 1.17.2 Python 3.7.4

[francois-durand]

Thanks for your answers. I opened a ticket on bugs.python.org: https://bugs.python.org/issue39274 .

[seberg]

I opened a PR to python to fix things there. I doubt we can change anything in NumPy in a reasonable time-frame, so closing.