随笔分类 - Python
摘要：降低插件版本 pip install urllib3==1.26.16 -i https://pypi.tuna.tsinghua.edu.cn/simple
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摘要：pip install SQLAlchemy
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摘要：''' 异步迭代器 ''' import asyncio class MyRange: def __init__(self, total=0): self.total = total self.count = 0 def __aiter__(self): return self async def
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摘要：''' 异步上下文管理 ''' import asyncio class ContextManager: def __init__(self): self.conn = None async def action(self): return self.conn async def __aenter_
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摘要：''' 同步上下文管理器 ''' import time class ContextManager: def __init__(self): self.conn = None def action(self): return self.conn def __enter__(self): # 链接数据
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摘要：import asyncio import time from concurrent.futures import ThreadPoolExecutor def download_img(url): print(f"下载图片:{url}") time.sleep(1) print(f"下载完成:{u
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摘要：import time from concurrent.futures import ThreadPoolExecutor def download_img(url): print(f"下载图片:{url}") time.sleep(1) print(f"下载完成:{url}") def main(
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摘要：''' concurrent.futures 模块提供异步执行可调用对象高层接口，使用线程池 ThreadPoolExecutor 或 进程池 ProcessPoolExecutor 来实现异步。目的是保证服务稳定运行的前提下提供最大的并发能力。 ''' from concurrent.future
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摘要：import asyncio from asyncio import Future async def f1(): print(1) await asyncio.sleep(3) print(2) return "f1" def callback(f: Future): f.get_loop().s
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摘要：import asyncio from functools import partial from asyncio import Future async def f1(): print(1) await asyncio.sleep(2) print(2) return "f1" def callb
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摘要：相同点: 从功能上看， asyncio.wait 和 asyncio.gather 实现的效果是相同的。 不同点: 使用方式不一样，wait需要传一个可迭代对象，gather传多个元素 wait比gather更底层，gather可以直接得到结果，wait先得到future再得到结果 wait可以通过
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摘要：import asyncio async def f1(): print(1) await asyncio.sleep(2) print(2) async def f2(): print(3) await asyncio.sleep(2) print(4) async def main(): pri
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摘要：import asyncio import aiohttp async def download_img(session, url): file_name = url.rsplit('/')[-1] print(f"下载图片:{file_name}") await asyncio.sleep(2)
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摘要：import asyncio async def f1(): print(1) await asyncio.sleep(2) print(2) async def f2(): print(3) await asyncio.sleep(2) # 等 可以等待的对象 print(4) tasks = [
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摘要：from gmssl import sm4, sm3 def sm3_hash(message: str): """ 国密sm3加密 :param message: 消息值，bytes类型 :return: 哈希值 """ msg_list = [i for i in bytes(message.e
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摘要：import pymysql from sqlalchemy import create_engine from sqlalchemy.orm import sessionmaker from sqlalchemy import Column, String, Integer from sqlalc
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摘要：import pymysql from sqlalchemy import create_engine from sqlalchemy.orm import sessionmaker from sqlalchemy import Column, String, Integer from sqlalc
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摘要：import pymysql from sqlalchemy import create_engine from sqlalchemy.orm import sessionmaker from sqlalchemy import Column, String, Integer from sqlalc
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摘要：from urllib.parse import quote_plus as urlquote # 指定连接的MySQL数据库 PASSWORD = 'root@demo.demo' DATABASE_URL = f"mysql://root:{urlquote(PASSWORD)}@10.105.
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摘要：import pymysql # 获取连接 conn = pymysql.connect( host='10.105.212.1', port=3306, user='root', password='DemoDemo', database='db', charset='utf8' ) cursor
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