Developers can use type hints to specify which type a function is expected to return. These annotations are not enforced at runtime and returning a different type might not fail. It is however likely to be unintended and will lead to maintainability issues, if not bugs.
This rule raises an issue when a function or method returns a value that contradicts its type hint.
== Noncompliant Code Example
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def hello() -> str:
return 42 # Noncompliant. Function's type hint asks for a string return value
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== Compliant Solution
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def hello() -> str:
return "Hello"
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== See
* https://docs.python.org/3/library/typing.html[Python documentation - Support for type hints]
