mypy | Optional static typing for Python | Code Analyzer library
kandi X-RAY | mypy Summary
kandi X-RAY | mypy Summary
. Mypy: Static Typing for Python.
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Top functions reviewed by kandi - BETA
- 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 .
mypy Key Features
mypy Examples and Code Snippets
Lines of Code : 25License : Permissive (MIT)
Copyfrom mypy.plugin import Plugin
from mypy.plugins.attrs import (
attr_attrib_makers,
attr_class_makers,
attr_dataclass_makers,
)
# These work just like `attr.dataclass`.
attr_dataclass_makers.add("my_module.method_looks_like_attr_dataclass") $ mypy t.py
t.py:12: error: Argument 1 to "SomeClass" has incompatible type "str"; expected "int"
@attr.s
class SomeClass:
a_number = attr.ib(default=42) # type: int
list_of_numbers = attr.ib(factory=list, type=list[int])
[mypy]
plugins = numpy.typing.mypy_plugin def add(x: int, y: int) -> int:
return x + y
AnyEnum = TypeVar("AnyEnum", Enum, IntEnum)
def decode(value: str, enum_class: Type[AnyEnum]) -> AnyEnum:
return make_map(enum_class)[value]
@functools.cache()
def make_map(enum_class: Type[AnyEnum]) -> Dict[str, AnyEnum]:
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
python -m pip install --user cython
python -m pip install --user cytoolz
python -m pip install --user eth-brownie
class BaseClass(metaclass=ABCMeta):
@property
@abstractmethod
def class_name(self) -> str:
pass
@property
@abstractmethod
def class_val(self) -> int:
pass
@abstractmethod
def foo(self):
class Config(NamedTuple):
func: Callable[[int], int] | Callable[[str], int]
Callable[[int & str], int]
Callable[[int | str], int]
def repr(x: object) -> str: ...
Community Discussions
Trending Discussions on mypy
QUESTION
I'm trying to install eth-brownie using 'pipx install eth-brownie' but I get an error saying
...ANSWER
Answered 2022-Jan-02 at 09:59I 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.
QUESTION
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:
...ANSWER
Answered 2022-Jan-31 at 15:10As 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.
QUESTION
If I have the file mypytest/models.py that looks like this:
ANSWER
Answered 2022-Feb-12 at 00:16I 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:
QUESTION
Instance attributes are typically annotated on the class:
...ANSWER
Answered 2022-Feb-03 at 17:05This is currently broken in mypy as it assumes you are creating a method, here is the relevant issue https://github.com/python/mypy/issues/708.
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.
QUESTION
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
ANSWER
Answered 2021-Nov-14 at 17:00You 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.
QUESTION
I have the following in test.py:
ANSWER
Answered 2022-Jan-22 at 19:13The syntax you use is recognized as a function stub, not as a function implementation.
Normally, a function stub is written as:
QUESTION
I have an input file
...ANSWER
Answered 2022-Jan-14 at 10:30Using sed:
QUESTION
Consider the following code:
...ANSWER
Answered 2022-Jan-09 at 18:56A 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.
QUESTION
The following code:
...ANSWER
Answered 2022-Jan-07 at 15:46I 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
QUESTION
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:
...ANSWER
Answered 2022-Jan-06 at 15:02It'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
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No vulnerabilities reported
Install mypy
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.
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