[issue38210] Intersection of dict view with iterator returns empty set

[Łukasz Langa]

Łukasz Langa <lukasz at langa.pl> added the comment:

This caused an unintentional behavior change in the following code:

>>> {1: 2}.items() & {1: {2: 3}}.items()
set()

Before this change, Python 3.6 - 3.8 behaved like this instead:

>>> {1: 2}.items() & {1: {2: 3}}.items()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'dict'

Interestingly, this doesn't seem to have a negative effect on correctness as the silently omitted unhashable (k, v) pair is only omitted if it's different between the two dictionaries:

>>> {1: {2: 4}}.items() & {1: {2: 3}}.items()
set()
>>> {2: 1, 1: {2: 4}}.items() & {2: 1, 1: {2: 3}}.items()
{(2, 1)}

If it's the same, we still get an error in Python 3.9:

>>> {1: {2: 3}}.items() & {1: {2: 3}}.items()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'dict'
>>> {2: 1, 1: {2: 3}}.items() & {2: 1, 1: {2: 3}}.items()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'dict'

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nosy: +lukasz.langa

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38210>
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