If your mypy runs feel slow, you should probably use the mypyĭaemon, which can speed up incremental mypy runtimes byĪ factor of 10 or more. TypeError: unsupported operand type(s) for |: 'type' and 'type' from use of new syntaxįor dealing with these, see Annotation issues at runtime. ImportError or ModuleNotFoundError from use of stub definitions not available at runtime TypeError: 'type' object is not subscriptable from types that are not generic at runtime NameError: name "X" is not defined from forward references These can result in some of theįollowing errors when trying to run your code: Idiomatic use of type annotations can sometimes run up against what a given This behaviour can be surprising and result in Including imports or docstrings) has the effect of ignoring the entire contents of the module. Note that a # type: ignore comment at the top of a module (before any statements, To replace the contents of a module with Any, use a per-module follow_imports = skip. To only ignore errors with a specific error code, use a top-level To only ignore errors, use a top-level # mypy: ignore-errors comment instead. Mypy will only look at the stub fileĪnd ignore the implementation, since stub files take precedence
_wrapped, a )įinally, you can create a stub file (. def _getattr_ ( self, a : str ) -> Any : return getattr ( self. See Unreachable code for more information.Ī function annotated as returning a non-optional type returns ‘None’Ĭlass Wrapper.
Mypy considers some of your code unreachable. See Following imports for more information. Use of these flags is strongly discouraged and only required in Use of the -follow-imports=skip flags can alsoĬause problems. On a per-module basis will make bad surprises less likely and is highly encouraged.
value = valueĪ common source of unexpected Any values is theĪny imported module that cannot be found is silently replaced with Any.Īs mentioned in Missing imports, setting ignore_missing_imports=True value ) # Revealed type is "Any" class Good : def _init_ ( self ) -> None : # Explicitly return None self. value + 1 # No error! reveal_type ( bad ) # Revealed type is "_main_.Bad" reveal_type ( bad. value = "asdf" 1 + "asdf" # No error! bad = Bad () bad.
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