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gh-85668: Create public API for typing._eval_type #21753
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Hm, you have to fill in globalns and localns if they are None, the same as get_type_hints does. And add tests for this.
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What should I fill them with? Unlike
get_type_hints
,eval_type
is not aware of the context it's being used in, so it's the user's responsibility to provide one (in form ofglobalns
andlocalns
).get_type_hints
retrieves the namespace from the passed object, buteval_type
only receives a type (declaration).There was a problem hiding this comment.
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Good point, but then you shouldn't give then a default value of None. :-)
My proposal: require globalns, and let localns default to globalns.
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The intention behind giving a default of
None
to both parameters was to not prioritize one over the other. If one should take priority,globalns
is certainly the better choice already from considering the order of parameters (to be consistent withget_type_hints
).But do we even need a distinction between global and local namespace at this point? What about exposing a single parameter
namespace
without default? The user can always do something likeeval_type(t, namespace=globals() | locals())
.By the way, I realized that
ForwardRef._evaluate
setsglobalns = localns
if the former is None and the latter isn't. These are then passed toeval
. Sinceeval
accepts any mapping forlocals
but requires adict
forglobals
this can lead to the following error:Does that mean that either
ForwardRef._evaluate
or the neweval_type
should include another safety check?