[Python-Dev] PEP 550 v4 (original) (raw)

Greg Ewing greg.ewing at canterbury.ac.nz
Thu Sep 7 19:52:57 EDT 2017

Elvis Pranskevichus wrote:

By default, generators reference an empty LogicalContext object that is allocated once (like the None object). We can do that because LCs are immutable.

Ah, I see. That wasn't clear from the implementation, where

 gen.__logical_context__ = contextvars.LogicalContext()

looks like it's creating a new one.

However, there's another thing: it looks like every time a generator is resumed/suspended, an execution context node is created/discarded.

-- Greg

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