-
-
Notifications
You must be signed in to change notification settings - Fork 2.9k
New issue
Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.
By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.
Already on GitHub? Sign in to your account
Error accessing named tuple defined within import cycle #3054
Comments
The same is true for |
Closed
JukkaL
pushed a commit
that referenced
this issue
Sep 27, 2017
Forward references didn't work with anything apart from classes, for example this didn't work: ``` x: A A = NamedTuple('A', [('x', int)]) ``` The same situation was with `TypedDict`, `NewType`, and type aliases. The root problem is that these synthetic types are neither detected in first pass, nor fixed in third pass. In certain cases this can lead to crashes (first six issues below are various crash scenarios). This fixes these crashes by applying some additional patches after third pass. Here is the summary of the PR: * New simple wrapper type `ForwardRef` with only one field `link` is introduced (with updates to type visitors) * When an unknown type is found in second pass, the corresponding `UnboundType` is wrapped in `ForwardRef`, it is given a "second chance" in third pass. * After third pass I record the "suspicious" nodes, where forward references and synthetic types have been encountered and append patches (callbacks) to fix them after third pass. Patches use the new visitor `TypeReplacer` (which is the core of this PR). Fixes #3340 Fixes #3419 Fixes #3674 Fixes #3685 Fixes #3799 Fixes #3836 Fixes #3881 Fixes #867 Fixes #2241 Fixes #2399 Fixes #1701 Fixes #3016 Fixes #3054 Fixes #2762 Fixes #3575 Fixes #3990
Sign up for free
to join this conversation on GitHub.
Already have an account?
Sign in to comment
Mypy doesn't recognize access to a named tuple defined in another module within an import cycle, if the other module is processed later than the module that contains the reference to the named tuple.
Example:
A potential fix is to process references to types in a later phase of semantic analysis than type definitions.
This is related to #3016.
The text was updated successfully, but these errors were encountered: