[New-bugs-announce] [issue38769] generators are currently hashable

[Anthony Sottile]

New submission from Anthony Sottile <asottile at umich.edu>:

We recently found a bug in one of our codebases that looked ~roughly like this:

class C:
    ...

    def __hash__(self):
        return hash((v for k, v in sorted(self.__dict__.items())))

which resulted in a production bug

The *intention* was to hash a tuple of those elements but the author had forgotten the `tuple(...)` call (or incorrectly assumed a parenthesized generator was a tuple comprehension) -- either way it seems wrong that generators are currently hashable as they are mutable

Thoughts on `__hash__ = None` for generators?

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components: Interpreter Core
messages: 356382
nosy: Anthony Sottile
priority: normal
severity: normal
status: open
title: generators are currently hashable
versions: Python 3.9

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38769>
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