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dtype of mixed ints and strings depends on the element order
See original GitHub issueThe dtype of NumPy array created from a Python list containing both ints and strings depends on the order of the elements:
In [3]: np.array(['a', 1]).dtype
Out[3]: dtype('<U1')
In [4]: np.array([1, 'a']).dtype
Out[4]: dtype('<U21')
tested on Python 3.5.2 and NumPy 1.11.1
Note that it’s related (but not the same) to issue #6550
Issue Analytics
- State:
- Created 7 years ago
- Reactions:2
- Comments:6 (5 by maintainers)
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Its fixed and deprecated in 1.20, you have to use
np.array([1, "a"], dtype="U"), which will give you the identical result in both cases to begin with. The result is than always length 1, just because that is the more common variant currently.Looks like it is saving space for the maximum size int with sign in the
U21case. Could just be a logic error somewhere…