8000 gh-74929: PEP 667 general docs update by ncoghlan · Pull Request #119201 · python/cpython · GitHub
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exec quirk affects classes, too
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ncoghlan committed May 21, 2024
commit e0ba6c73125fdb4083fe382d27c8b82dccb63960
6 changes: 3 additions & 3 deletions Doc/library/functions.rst
Original file line number Diff line number Diff line change
Expand Up @@ -620,9 +620,9 @@ are always available. They are listed here in alphabetical order.

When ``exec`` gets two separate objects as *globals* and *locals*, the
code will be executed as if it were embedded in a class definition. This
means functions defined in the executed code will not be able to access
variables assigned at the top level (as the "top level" variables are
treated as class variables in a class definition).
means functions and classes defined in the executed code will not be able
to access variables assigned at the top level (as the "top level"
variables are treated as class variables in a class definition).
Passing a :class:`collections.ChainMap` instance as *globals* allows name
lookups to be chained across multiple mappings without triggering this
behaviour. Values assigned to top-level names in the executed code can be
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