PEP 550. Early thinking about how Python handles context in concurrent programs.

github.com/gvanrossum/pep550

Problem

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Audience

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Market

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Pricing

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Updates

December 2017

Make AbstractContext subclass (immutable) Mapping, make _setitem, _de… Dec 8
Remove ContextVar.delete() Dec 8
Add Token class, returned from set(), can be used by reset() Dec 8

October 2017

Rename set_ctx to _set_ctx Oct 18
Add proposed Context.run() function Oct 18
Add get(default=<value>) Oct 17
A (much) simpler model Oct 17

September 2017

Add ContextVar.get_stack() (#3) Sep 11
Rename ContextVar.setx() -> ContextVar.set() Sep 11
Rename ContextVar.setx() -> ContextVar.set() Sep 11
Refactor run() stuff again Sep 8
Fix --disallow-any flags (there must only be one) Sep 8
Be stricter in types. Add Makefile so we can write 'make mypy' Sep 8
ContextVar needs only one type parameter. Sep 8
Few updates after discussion Sep 8
Add some text (scratchpad) Sep 8
Make ContextVar.get() raise a LookupError Sep 8
Renames: FrozenDict -> LocalContext; LocalContext -> ContextHolder Sep 8
Precompute depth Sep 7
Refactor run() methods/functions Sep 7