New submission from Alexander Mentis :
Documentation for set/frozenset says |=, &=, -=, ^= operators do not apply to immutable instances of frozenset. This is incorrect. These operators can be used on frozenset; however, they behave differently on frozenset than on set. When used with set, they modify the target set in place. When used with frozenset, they return a new frozenset that replaces the target frozenset.
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assignee: docs@python
components: Documentation
messages: 305981
nosy: Alexander Mentis, docs@python
priority: normal
severity: normal
status: open
title: Set operations documentation error
versions: Python 2.7, Python 3.4, Python 3.5, Python 3.6, Python 3.7
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Python tracker
https://bugs.python.org/issue31995
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