在注解库 typing.py 中,定义了 Generator,AsyncGenerator,Iterator,AsyncIterator: Generator = _alias(collections.abc.Generator, 3) AsyncGenerator = _alias(collections.abc.AsyncGenerator, 2) AsyncIterator = _alias(collections.abc.AsyncIterator, 1) Iterator = _alias(collections.abc.Iterator, 1) 它们都...
AsyncGenerator = typing.AsyncGenerator AsyncIterable = typing.AsyncIterable AsyncIterator = typing.AsyncIterator Awaitable = typing.Awaitable ByteString = typing.ByteString Callable = typing.Callable ClassVar = typing.ClassVar Collection = typing.Collection Container = typing.Container ContextManager = typi...
from contextlib import asynccontextmanager from typing import AsyncGenerator, TypeVar, Optional from asyncpg import create_pool, Pool, Connection T = TypeVar('T') class DatabaseManager: def __init__(self, dsn: str): self.dsn = dsn self._pool: Optional[Pool] = None async def initialize(se...
通过类型注解,类型注释和typing, 我们可以在IDE看到提示,配合使用 mypy 等工具,我们就可以对 Python 代码做静态类型检查了 安装 pip install mypy 使用
typing 模块 3.1 List 3.2 Dict 3.3 Any 3.4 Callable 3.5 ClassVar 3.6 Final 3.7 Literal 3.8 Optional 3.9 Tuple 3.10 Type 3.11 Union 3.12 Set 3.13 FrozenSet 3.14 TypedDict 3.15 Generator 3.16 IO、TextIO、BinaryIO 3.17 Pattern、Match 3.18 TypeVar ...
(Previous versions oftrio_typingprovided an analogous ABC forNursery, but the actual class is available astrio.Nurseryas of Trio 0.12.0; you should use that instead.) A backport oftyping.AsyncGenerator[YieldT, SendT]to Python 3.5. (YieldTis the type of values yielded by the generator, and...
At the heart of async IO are coroutines. A coroutine is a specialized version of a Python generator function. Let’s start with a baseline definition and then build off of it as you progress here: a coroutine is a function that can suspend its execution before reaching return, and it can...
Package Version --- --- absl-py 0.8.1 alembic 1.8.1 altair 4.2.0 anyio 3.6.1 argon2-cffi 21.3.0 argon2-cffi-bindings 21.2.0 aspy.yaml 1.3.0 astor 0.8.1 astroid 2.4.1 async-generator 1.10 attrs 22.1.0 audioread 2.1.8 autopep8 1.6.0 Babel 2.8.0 backcall 0.1.0 backports.zone...
使用async def定义的函数或方法,在其主体中有yield。调用时,它们返回一个用于与async for一起使用的异步生成器。在 Python 3.6 中添加。 生成器、本机协程和异步生成器函数与其他可调用对象不同,它们的返回值永远不是应用程序数据,而是需要进一步处理以产生应用程序数据或执行有用工作的对象。生成器函数返回迭代器。
Generator objects (a.k.a. generators) are iterators. Generators are often considered the easiest way to make an iterator. They can also be used for implementing coroutines, though that's usually done using Python's async/await syntax. Note that I've purposely defined the term "generator" di...