Ignore await and typing ellipsis as non-effectful statements - #22291
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Ignore await and typing ellipsis as non-effectful statements#22291maxfischer2781 wants to merge 8 commits into
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This PR extends the Python
StatementNoEffectquery to ignoreawaitand many typing ellipses expression statements.awaitexpression statements (closes LGTM.com - false positive "Statement has no effect" for Python await #11235)awaitis used to switch between coroutines and execute long-running effects. While strictly speaking anawaitcan have no side-effect, these are so rare that a purely syntactical analysis seems appropriate....as the sole expression statement of a typing stub body (closes False positive – "Statement has no effect" for Python type hint ellipsis #11351)@typing.overloadindicates a function definition purely for its signature, not implementation. An...expression statement is commonly used for the body to denote that the body is insignificant.@typing.overload, aProtocolis only defined for its methods. An...expression is commonly used for statement bodies.The
Protocolcheck covers transitive subclasses ofProtocolbut currently misses genericProtocols (e.g.class Foo(Protocol[T])andclass Bar(Foo[int])); I have only been able to select subscripts outside ofclassstatements. The current state should already eliminate many false positives, but the proper one needs more investigation from my side - this might need to be covered in a later PR if it turns out to be too complicated now.