erictraut
commented
11 months ago If you run the code in your example, you will receive a runtime exception from Python ("NameError: name 'MyClass' is not defined"). Pylance is warning you that your code will crash, so it's correct in generating an error here.
If you want to use a not-yet-declared identifier in a type annotation, you can do one of two things:
-
Enclose the type annotation in quotes.
class MyClass: def __init__(self): pass def myfunc(self) -> "MyClass": return self - Add a
from __future__ import annotationsto the top of your file. This tells the Python interpreter to defer evaluation of your annotations.from __future__ import annotations
class MyClass: def init(self): pass
def myfunc(self) -> MyClass:
return self
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Environment data
Code Snippet
Expected behavior
Pylance should not report an undefined variable error for a class method that returns an instance of the same class.
Actual behavior
Pylance reports an undefined variable error for a class method that returns an instance of the same class.
Logs