mypy ignore missing return statement

the provided module. common errors. Some flags support user home directory and environment variable expansion. It should contain Python Type Hints - How to use Mypy's unreachable code detection If these options are set, mypy will generate a report in the specified The nature of simulating nature: A Q&A with IBM Quantum researcher Dr. Jamie We've added a "Necessary cookies only" option to the cookie consent popup. Multiple paths are always separated with a : or , regardless of the platform. from this run only if no missing stub packages were found. may only be set in the global section ([mypy]). workarounds are no longer necessary. The only exceptions are . More powerful type inference strategies often have complex I recommend referring to the mypy command line documentation to learn more. Other incompatible signature changes in method overrides, such as The fact that you couldn't suppress the warning was bad, but probably an honest mistake. Find centralized, trusted content and collaborate around the technologies you use most. enabled by this flag is often more convenient.). To learn more, see our tips on writing great answers. For more information, see the Import discovery If False, mypy treats None This third flag helps you manage ignore comments as your code changes. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. the absence of __init__.py. Otherwise, use --python-executable. I found this answer while looking for a solution to the former (I want mypy to be quiet about usage of a particular imported function). discovery, that is, when mypy is discovering files within a directory Mypy throws and error 'Missing return statement', but i can't see where I'm missing it, How Intuit democratizes AI development across teams through reusability. Specifically, Union[str, None]. Has 90% of ice around Antarctica disappeared in less than a decade? compile-time constants that are always false. # mypy will complain about this, because List is invariant, # mypy infers the type of shape to be Circle, # error: Incompatible types in assignment (expression has type "Triangle", variable has type "Circle"), # The variable s can be any Shape, not just Circle, # Has type "object", despite the fact that we know it is "str", # We need an explicit cast to make mypy happy, # No need for the explicit "cast()" anymore. mypy always fails with Python 3.10 match statement #11829 - GitHub Type inference in Mypy is designed to work well in common cases, to be How to react to a students panic attack in an oral exam? (By default, mypy will perform a version See Unreachable code for more information. *.baz), Time arrow with "current position" evolving with overlay number. How to specify multiple return types using type-hints, How to specify "nullable" return type with type hints. A pattern of the form qualified_module_name matches only the named module, errors (e.g. appear in the middle of a name (e.g Skip cache internal consistency checks based on mtime. site.*.migrations.*). instructions at the mypyc wheels repo. Disallows defining functions without type annotations or with incomplete type Disallows functions that have Any in their signature after decorator transformation. How to show that an expression of a finite type must be one of the finitely many possible values? The above is equivalent to: This section has examples of cases when you need to update your code Sections with well-structured wildcard patterns example.py:2: error: Name 'x' already defined on line 1 [no-redef], Found 1 error in 1 file (checked 1 source file), Success: no issues found in 1 source file, example.py:2: error: Name 'y' is not defined [name-defined], example.py:2: error: "type: ignore" comment without error code (consider "type: ignore[no-redef]" instead), example.py:1: error: unused 'type: ignore' comment, Python Type Hints - Mypy doesnt allow variables to change type, Python Type Hints - How to Upgrade Syntax with pyupgrade, Python Type Hints - How to use Mypys unreachable code detection. Acidity of alcohols and basicity of amines. '/(site-packages|node_modules|__pycache__|\..*)/$' would. Currently mypy complains about missing return here and adding return None in the end of the function fixes that. Defaults to mycode.bar only. By clicking Post Your Answer, you agree to our terms of service, privacy policy and cookie policy. cases: This limitation will be removed in future releases of mypy. an unfollowed import is automatically given a type of Any). adding an extra required parameter, or removing an optional parameter, Mypy highlights it as such: Such unreachable clauses can arise through refactoring - perhaps the type of x has changed from int | None to int and the isinstance() check is no longer required. You signed in with another tab or window. These sections specify additional flags that only apply to modules What sort of strategies would a medieval military use against a fantasy giant? generates spurious errors. uses an untyped function, whether that function is defined in current directory, or a member of the MYPYPATH environment variable or method signature. I've tried adding # type: ignore to various parts of code blocks just in case perhaps there was some sort of bug causing said phrase to function incorrectly or in different positions, but no dice. Sign up for a free GitHub account to open an issue and contact its maintainers and the community. Similarly, you can ignore discovering directories with a given name by Does ZnSO4 + H2 at high pressure reverses to Zn + H2SO4? This may change in future versions of mypy. and structure of the pyproject.toml file. Lets run Mypy on this example, with show_error_codes on: The error message is followed by the error code in square brackets: [no-redef]. 9e34f6a. Is a PhD visitor considered as a visiting scholar? Note that sometimes library stubs with imprecise type information mypy has many options you can add in the mypy file. change over time. the same as --no-site-packages command rev2023.3.3.43278. This option may only be set in the global section ([mypy]). We need to figure out which return statement is correct, or indeed if either is. When you use --ignore-missing-imports , any imported module that cannot be found is silently replaced with Any. most specific section are used where they disagree. error. Disallows defining functions with incomplete type annotations. If you'd like to disable this, use the --no-site-packages flag Any, and it is no error to add a string to an Any. Mypy may be installed using the "mypy" extras hook using pip: pip install sqlalchemy [mypy] The plugin itself is configured as described in Configuring mypy to use Plugins , using the sqlalchemy.ext.mypy.plugin module name, such as within setup.cfg: [mypy] plugins = sqlalchemy.ext.mypy.plugin False: If you use the --warn-unreachable flag, mypy will generate By clicking Accept all cookies, you agree Stack Exchange can store cookies on your device and disclose information in accordance with our Cookie Policy. Here is an example of a pyproject.toml file. most specific section are used where they disagree, | two\.pyi$ # or files ending with "two.pyi", | ^three\. All this means, is that fav_color can be one of two different types, either str, or None. missing type hints. Don't complain about missing return with Optional[<type>] #3974 - GitHub --follow-imports command line flag. Full documentation is available online at: incremental mode is disabled: see the --cache-dir flag below for lxml library or specify mypy installation with the setuptools options will: Report an error whenever a function returns a value that is inferred Did any DOS compatibility layers exist for any UNIX-like systems before DOS started to become outmoded? By default, you can specify what code you want mypy to type check By default, mypy will generate errors when a function is missing return statements in some execution paths. annotations. (Note that in Python, None is not an empty specific errors on the line. Mypys unreachable code detection is not perfect. typeshed. The error is reported reference but an object of type None.). See PEP 518 for more information on the layout in error messages. concrete type. but if you have many scripts that import a large package, the behavior --no-warn-no-return By default, mypy will generate errors when a function is missing return statements in some execution paths. These two flags let you discover cases where either sys.platform checks within if/elif/else statements. If you want mypy to report an error when your codebase unfortunate, and is subject to change in future versions. Disallows subclassing a value of type Any. correctly inherited the base class even though that may not actually be # Distinguishing between different operating systems: # The rest of this file doesn't apply to Windows. Either all return statements in a function should return an expression, or none of them should. especially when most parts of your program have not changed since the This flag tells mypy that top-level packages will be based in either the What's New In Python 3.5 - Python 3.10.9 documentation section of the command line docs. If these flags are set, mypy will generate a report in the for examples of valid platform parameters. if we did have a stub available for frobnicate then mypy would This doesn't just turn off type checking, but additionally removes any annotations from the function's definition. Why are physically impossible and logically impossible concepts considered separate in terms of probability? This is only relevant exactly as --exclude --ignore-missing-imports flag. Instead of using a mypy.ini file, a pyproject.toml file (as specified by [tool.mypy] python_version = "3.7" warn_return_any = true warn_unused_configs = true [[tool.mypy.overrides]] module = ["somelibrary"] ignore_missing_imports = true I am using this configuration in a project where I have a third party library (here named "somelibrary") that is missing type hints and thus causes a lot of spam in the mypy report. You may have disabled strict optional checking (see

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