python-typing

How to reference static method from class variable [duplicate]

由 核能气质少年 提交于 2020-01-11 09:07:33
问题 This question already has answers here : Accessing class variables from a list comprehension in the class definition (5 answers) Closed 16 days ago . Given the class from __future__ import annotations from typing import ClassVar, Dict, Final import abc class Cipher(abc.ABC): @abc.abstractmethod def encrypt(self, plaintext: str) -> str: pass @abc.abstractmethod def decrypt(self, ciphertext: str) -> str: pass class VigenereCipher(Cipher): @staticmethod def rotate(n: int) -> str: return string

How do I specify this kind of variable argument tuple with python typing?

由 半腔热情 提交于 2019-12-31 02:46:07
问题 I'm trying to do this, but I'm not sure how to specify the type signature: def initialize_signals( self, command: InitializeCommand, initializers: Iterable[Union[ Tuple[SignalNode], Tuple[SignalNode, Any, ...] ]]): for x, *args in initializers: potential_update = command.create_potential_update(x, *args) 回答1: there currently isn't an annotation which can represent the addition of a fixed-length tuple with a variable length tuple. here's some code I used to determine how mypy's inference would

NameError: name 'List' is not defined

由 泪湿孤枕 提交于 2019-12-19 16:12:15
问题 I'm really unsure why this isn't working. Here is the important part of the code (it's from a leetcode challenge). The first line throws the NameError. def totalFruit(self, tree: List[int]) -> int: pass If I try importing List first I get an error No module named 'List' . I'm using Python 3.7.3 from Anaconda. 回答1: To be able to annotate what types your list should accept, you need to use typing.List from typing import List So did you import List ? 回答2: To be able to specify a list of str's in

How do you alias a type?

由 耗尽温柔 提交于 2019-12-18 19:28:13
问题 In some (mostly functional) languages you can do something like this: type row = list(datum) or type row = [datum] So that we can build things like this: type row = [datum] type table = [row] type database = [table] Is there a way to do this in Python? You could do it using classes, but Python has quite some functional aspects so I was wondering if it could be done an easier way. 回答1: Python is dynamically typed. While Łukasz R.'s answer is correct for type hinting purposes (which can in turn

Python typing for module type

由 流过昼夜 提交于 2019-12-18 18:55:25
问题 I am dynamically loading a Python module using importlib.import_module as follows def load_module(mod_name: str) -> ???: return importlib.import_module(mod_name) Can somebody tell me what is the correct type annotation for a module type. The typing module does not contain one and I could not find an answer elsewhere. 回答1: You're looking for types.ModuleType. 来源： https://stackoverflow.com/questions/48389157/python-typing-for-module-type

How to use Generic (higher-kinded) type variables in python's type hinting system?

由 混江龙づ霸主 提交于 2019-12-02 07:02:59
问题 Suppose I want to write a generic class using mypy, but the type argument for the class is itself a generic type. For example: from typing import TypeVar, Generic, Callable A = TypeVar("A") B = TypeVar("B") T = TypeVar("T") class FunctorInstance(Generic[T]): def __init__(self, map: Callable[[Callable[[A], B], T[A]], T[B]]): self._map = map def map(self, x: T[A], f: Callable[[A], B]) -> T[B]: return self._map(f, x) When I try to call mypy in the definition above I get an error: $ mypy

How to use Generic (higher-kinded) type variables in python's type hinting system?

由 て烟熏妆下的殇ゞ 提交于 2019-12-02 04:25:47
Suppose I want to write a generic class using mypy, but the type argument for the class is itself a generic type. For example: from typing import TypeVar, Generic, Callable A = TypeVar("A") B = TypeVar("B") T = TypeVar("T") class FunctorInstance(Generic[T]): def __init__(self, map: Callable[[Callable[[A], B], T[A]], T[B]]): self._map = map def map(self, x: T[A], f: Callable[[A], B]) -> T[B]: return self._map(f, x) When I try to call mypy in the definition above I get an error: $ mypy typeclasses.py typeclasses.py:9: error: Type variable "T" used with arguments typeclasses.py:12: error: Type

How do I specify this kind of variable argument tuple with python typing?

由 怎甘沉沦 提交于 2019-12-02 02:14:34
I'm trying to do this, but I'm not sure how to specify the type signature: def initialize_signals( self, command: InitializeCommand, initializers: Iterable[Union[ Tuple[SignalNode], Tuple[SignalNode, Any, ...] ]]): for x, *args in initializers: potential_update = command.create_potential_update(x, *args) there currently isn't an annotation which can represent the addition of a fixed-length tuple with a variable length tuple. here's some code I used to determine how mypy's inference would handle something like this: from typing import Tuple x: Tuple[int, ...] y = ('hi', *x) z = (*x,) reveal

How do you alias a type?

由 自闭症网瘾萝莉.ら 提交于 2019-11-30 19:07:26
In some (mostly functional) languages you can do something like this: type row = list(datum) or type row = [datum] So that we can build things like this: type row = [datum] type table = [row] type database = [table] Is there a way to do this in Python? You could do it using classes, but Python has quite some functional aspects so I was wondering if it could be done an easier way. Python is dynamically typed. While Łukasz R.'s answer is correct for type hinting purposes (which can in turn be used for static analysis and linting), strictly speaking, you do not need to do anything to make this

Python typing for module type

由 懵懂的女人 提交于 2019-11-30 17:33:53
I am dynamically loading a Python module using importlib.import_module as follows def load_module(mod_name: str) -> ???: return importlib.import_module(mod_name) Can somebody tell me what is the correct type annotation for a module type. The typing module does not contain one and I could not find an answer elsewhere. You're looking for types.ModuleType . 来源： https://stackoverflow.com/questions/48389157/python-typing-for-module-type
订阅 python-typing