mypy: Python objects do not correctly implement their interfaces - missing __jsii_proxy_class__

[rectalogic]

🐛 Bug Report

Affected Languages

• TypeScript or Javascript
• Python
• Java
• .NET (C#, F#, ...)
• Go

General Information

• JSII Version: 1.31.0
• Platform: Linux cureatr-vm.dev 5.10.25-linuxkit Consider adding support for Set<T> #1 SMP Tue Mar 23 09:27:39 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

What is the problem?

Running mypy on Python CDK code fails. Objects do not implement their interfaces:

/tmp/m.py:18: error: Argument "vpc" to "SecurityGroup" has incompatible type "Vpc"; expected "IVpc"
/tmp/m.py:18: note: "Vpc" is missing following "IVpc" protocol member:
/tmp/m.py:18: note:     __jsii_proxy_class__

See aws/aws-cdk#15651 for more details.

A variation on this was originally fixed in #2809 but now it is broken again.

[gshpychka]

Maybe edit the name to narrow down the scope, as it seems there are multiple issues that result in incorrect interface implementations, like this one:

#2927

[rectalogic]

Just tested with aws-cdk-lib 2.0.0rc27, constructs 10.0.9, jsii 1.41.0 and this is resolved.

[github-actions]

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