backwards iterable-ness

[pomalley]

import collections
isinstance([1,2,3]*ns, collections.Iterable)  # False
isinstance(1*ns, collections.Iterable)  # True

This seems backwards.

[zchen088]

Interestingly...

In [16]: np.iterable(1*ns)
Out[16]: 0

In [17]: np.iterable([1, 2, 3]*ns)
Out[17]: 1

[ejeffrey]

huh. So collections.Iterable tests for the presence of the __iter__ method. Value and friends have an __iter__ method that raises a TypeError. I don't know why. My guess is that if you *don't* implement __iter__, then under some circumstance python and/or numpy will try to iterate by calling __getitem__, which will do something stupid on a Value object.

…

On Wed, Feb 7, 2018 at 11:06 AM, Zijun Chen ***@***.***> wrote: Interestingly... In [16]: np.iterable(1*ns) Out[16]: 0 In [17]: np.iterable([1, 2, 3]*ns) Out[17]: 1 — You are receiving this because you are subscribed to this thread. Reply to this email directly, view it on GitHub <#351 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/ABnKHPmRfkpP5Mar6LkGL9Ix1fhgXcCaks5tSfRMgaJpZM4R9N5Y> .