mypy | Optional static typing for Python | Code Analyzer library

 by   python Python Version: 1.10.0 License: Non-SPDX

kandi X-RAY | mypy Summary

kandi X-RAY | mypy Summary

mypy is a Python library typically used in Code Quality, Code Analyzer applications. mypy has no bugs, it has no vulnerabilities, it has build file available and it has high support. However mypy has a Non-SPDX License. You can install using 'pip install mypy' or download it from GitHub, PyPI.

. Mypy: Static Typing for Python.

            kandi-support Support

              mypy has a highly active ecosystem.
              It has 15523 star(s) with 2551 fork(s). There are 233 watchers for this library.
              There were 3 major release(s) in the last 6 months.
              There are 2433 open issues and 6644 have been closed. On average issues are closed in 459 days. There are 174 open pull requests and 0 closed requests.
              It has a negative sentiment in the developer community.
              The latest version of mypy is 1.10.0

            kandi-Quality Quality

              mypy has 0 bugs and 0 code smells.

            kandi-Security Security

              mypy has no vulnerabilities reported, and its dependent libraries have no vulnerabilities reported.
              mypy code analysis shows 0 unresolved vulnerabilities.
              There are 0 security hotspots that need review.

            kandi-License License

              mypy has a Non-SPDX License.
              Non-SPDX licenses can be open source with a non SPDX compliant license, or non open source licenses, and you need to review them closely before use.

            kandi-Reuse Reuse

              mypy releases are not available. You will need to build from source code and install.
              Deployable package is available in PyPI.
              Build file is available. You can build the component from source.
              Installation instructions are not available. Examples and code snippets are available.
              mypy saves you 67633 person hours of effort in developing the same functionality from scratch.
              It has 76136 lines of code, 6966 functions and 362 files.
              It has high code complexity. Code complexity directly impacts maintainability of the code.

            Top functions reviewed by kandi - BETA

            kandi has reviewed mypy and discovered the below as its top functions. This is intended to give you an instant insight into mypy implemented functionality, and help decide if they suit your requirements.
            • Process command line options
            • Returns whether a callable is compatible with a function or function .
            • Finds an IsInstance_type check .
            • Test whether two types are overlapping .
            • Checks if the given operation is reversible .
            • Builds a list of varargs .
            • Throw an exception for an invalid argument .
            • Emit cast .
            • Generate a function item .
            • Collect all attributes of a class .
            Get all kandi verified functions for this library.

            mypy Key Features

            No Key Features are available at this moment for mypy.

            mypy Examples and Code Snippets

            Extending-Wrapping the Decorator-Mypy
            Pythondot img1Lines of Code : 25dot img1License : Permissive (MIT)
            copy iconCopy
            from mypy.plugin import Plugin
            from mypy.plugins.attrs import (
            # These work just like `attr.dataclass`.
            Type Annotations-Mypy
            Pythondot img2Lines of Code : 6dot img2License : Permissive (MIT)
            copy iconCopy
            $ mypy
   error: Argument 1 to "SomeClass" has incompatible type "str"; expected "int"
            class SomeClass:
                a_number = attr.ib(default=42)  # type: int
                list_of_numbers = attr.ib(factory=list, type=list[int])
            New Features-Added a mypy plugin for handling platform-specific numpy.number precisions
            Pythondot img3Lines of Code : 0dot img3License : Permissive (BSD-3-Clause)
            copy iconCopy
            plugins = numpy.typing.mypy_plugin  
            Viewing a function parameters class methods in python
            Pythondot img4Lines of Code : 3dot img4License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            def add(x: int, y: int) -> int:
                return x + y
            Type hinting when multiple types are in input and output but in 1-to-1 relation between them
            Pythondot img5Lines of Code : 9dot img5License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            AnyEnum = TypeVar("AnyEnum", Enum, IntEnum)
            def decode(value: str, enum_class: Type[AnyEnum]) -> AnyEnum:
                return make_map(enum_class)[value]
            def make_map(enum_class: Type[AnyEnum]) -> Dict[str, AnyEnum]:
            Python liskov substition principle and custom init
            Pythondot img6Lines of Code : 5dot img6License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            class ImplB(ImplA):
                async def ainit(self, arg1: str, arg2: float, arg3: int) -> None:  # type: ignore [override]
                    await super().ainit(arg3, arg2)
                    self.c = arg1
            PIP failed to build package cytoolz
            Pythondot img7Lines of Code : 4dot img7License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            python -m pip install --user cython
            python -m pip install --user cytoolz
            python -m pip install --user eth-brownie
            Python check attribute type in inherited abstract class
            Pythondot img8Lines of Code : 28dot img8License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            class BaseClass(metaclass=ABCMeta):
               def class_name(self) -> str:
               def class_val(self) -> int:
               def foo(self):
            How to type a function attribute in NamedTuple
            Pythondot img9Lines of Code : 7dot img9License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            class Config(NamedTuple):
                func: Callable[[int], int] | Callable[[str], int]
            Callable[[int & str], int]
            Callable[[int | str], int]
            Python: overloading the return type for magic methods `__str__` and `__repr__`
            Pythondot img10Lines of Code : 2dot img10License : Strong Copyleft (CC BY-SA 4.0)
            copy iconCopy
            def repr(x: object) -> str: ...

            Community Discussions


            PIP failed to build package cytoolz
            Asked 2022-Mar-26 at 18:26

            I'm trying to install eth-brownie using 'pipx install eth-brownie' but I get an error saying



            Answered 2022-Jan-02 at 09:59

            I used pip install eth-brownie and it worked fine, I didnt need to downgrade. Im new to this maybe I could be wrong but it worked fine with me.



            Annotate dataclass class variable with type value
            Asked 2022-Feb-22 at 14:53

            We have a number of dataclasses representing various results with common ancestor Result. Each result then provides its data using its own subclass of ResultData. But we have trouble to annotate the case properly.

            We came up with following solution:



            Answered 2022-Jan-31 at 15:10

            As hinted in the comments, the _data_cls attribute could be removed, assuming that it's being used for type hinting purposes. The correct way to annotate a Generic class defined like class MyClass[Generic[T]) is to use MyClass[MyType] in the type annotations.

            For example, hopefully the below works in mypy. I only tested in Pycharm and it seems to infer the type well enough at least.



            Appeasing MyPy trying to use an instance variable
            Asked 2022-Feb-12 at 00:16

            If I have the file mypytest/ that looks like this:



            Answered 2022-Feb-12 at 00:16

            I believe the problem here is that db.Base is a variable, not a type alias.

            It's unclear from your example exactly why you need a dynamic base class. Inlining FakeBaseModel would obviously work; you could also just use a type alias while running the type checking:



            How to type hint an instance-level function (i.e. not a method)?
            Asked 2022-Feb-03 at 17:05

            Instance attributes are typically annotated on the class:



            Answered 2022-Feb-03 at 17:05

            This is currently broken in mypy as it assumes you are creating a method, here is the relevant issue

            Typing the function in the init works fine as it won't think it's a method on the class, the following code passes type checking properly and func's type is inferred from the parameter. The attribute assignment can also be typed directly if the parameter is not viable.



            Use string value for argument typed as Literal
            Asked 2022-Jan-26 at 17:45

            I use kms.decrypt() method from boto3 package. For typing support I use the boto3-stubs package.

            The decrypt method has attribute EncryptionAlgorithm, which is typed as



            Answered 2021-Nov-14 at 17:00

            You can use typing.get_args to get the arguments passed in to typing.Literal. In this case, you'll need to combine it with typing.cast so you can signal to "mypy" that the string value that the function returns is an acceptable Literal value.



            Why does `mypy --strict` not throw an error in this simple code?
            Asked 2022-Jan-22 at 19:13

            I have the following in



            Answered 2022-Jan-22 at 19:13

            The syntax you use is recognized as a function stub, not as a function implementation.

            Normally, a function stub is written as:



            How do I output only a capture group with sed
            Asked 2022-Jan-14 at 15:48

            I have an input file



            Answered 2022-Jan-14 at 10:30


            Mypy: Using unions in mapping types does not work as expected
            Asked 2022-Jan-10 at 12:04

            Consider the following code:



            Answered 2022-Jan-09 at 18:56

            A dict[str | tuple[str, str], str] isn't just a dict with either str or tuple[str, str] keys. It's a dict you can add more str or tuple[str, str] keys to.

            You can't add str keys to a dict[tuple[str, str], str], and you can't add tuple[str, str] keys to a dict[str, str], so those types aren't compatible.

            If you pass a literal dict directly to foo (or to bar or baz), that literal has no static type. mypy infers a type for the dict based on the context. Many different types may be inferred for a literal based on its context. When you pass b to foo inside bar or baz, b already has a static type, and that type is incompatible with foo's signature.



            enumerate causes incompatible type mypy error
            Asked 2022-Jan-07 at 16:23

            The following code:



            Answered 2022-Jan-07 at 15:46

            I don't know how it's affecting the types. I do know that using len() can work the same way. It is slower but if it solves the problem it might be worth it. Sorry that it's not much help



            Why does mypy fail with "incompatible type" in Enum classmethod?
            Asked 2022-Jan-07 at 09:23

            In my Enum, i have defined a classmethod for coercing a given value to an Enum member. The given value may already be an instance of the Enum, or it may be a string holding an Enum value. In order to decide whether it needs conversion, i check if the argument is an instance of the class, and only pass it on to int() if it is not. At which point – according to the type hints for the argument 'item' – it must be a string.

            The class look like this:



            Answered 2022-Jan-06 at 15:02

            It's because int cannot be constructed from Enum. From documentation of int(x)

            If x is not a number or if base is given, then x must be a string, bytes, or bytearray instance representing an integer literal in radix base

            So to make it work you can make your Enum inherit from str


            Community Discussions, Code Snippets contain sources that include Stack Exchange Network


            No vulnerabilities reported

            Install mypy

            You can install using 'pip install mypy' or download it from GitHub, PyPI.
            You can use mypy like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.


            For any new features, suggestions and bugs create an issue on GitHub. If you have any questions check and ask questions on community page Stack Overflow .
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