On Tue, Jan 2, 2018 at 4:51 PM, Victor Stinner <victor.stin...@gmail.com> wrote:
> Why ContextVar.reset(token) does nothing at the second call with the same > token? What is the purpose of Token._used? I guess that there is an use > case to justify this behaviour. > > reset() should have a result: true if the variable was restored to its > previous state, false if reset() did nothing because the token was already > used. And/Or Token should have a read-only "used" property. > That depends again on the use case. The only real purpose for reset() is to be able to write a context manager that sets and restores a context variable (like in `with decimal.localcontext()`). Handling double resets is about as useful as specifying what happens if __exit__ is called twice. -- --Guido van Rossum (python.org/~guido)
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