我们讲以Python 3.7 上的asyncio为例讲解如何使用Python的异步IO。...如果你的系统中还没有 Python 3.7,你可以参考Python的虚拟环境一文,来创建你的 Python 3.7 的虚拟环境。...再看下面的例子,我们定义了协程 say_delay() ,在main()协程中调用两次,第一次延迟1秒后打印“你好”,第二次延迟2秒后打印“猿人学”。这样我们通过 await 运行了两个协程。 ?...在Python 3.6中与它对应的是 ensure_future()。...create_task()的基本使用前面例子已经讲过。它返回的task通过await来等待其运行完。如果,我们不等待,会发生什么?“准备立即运行”又该如何理解呢?先看看下面这个例子: ?
def response(flow: http.HTTPFlow) -> None: flow.response.headers["newheader"] =...
/usr/bin/python #coding=utf-8 import argparse def parse_args(): description = "usage: % prog[options.../usr/bin/python # coding=utf-8 import argparse from argparse import ArgumentParser, RawTextHelpFormatter
rules=( Rule(LinkExtractor(allow=r'/web/site0/tab5240/info\d+.htm'),callback='p...
很久没写爬虫了,一个经典的Python爬虫例子,Python多线程爬虫例子案例,目标网站结构比较简单,适合练手使用,采用了经典的生产者和消费者模式,同时结合python类和装饰器的使用,应该能够让你获益不少...几个关键点: 1.python多线程 生产者与消费者模式 官方文档: 17.1. threading — 基于线程的并行 https://docs.python.org/zh-cn/3.6/library.../threading.html 两个案例参考: 用Python多线程实现生产者消费者模式 https://segmentfault.com/a/1190000008909344 python-多线程3-...参考: Python进阶-----静态方法(@staticmethod) https://www.cnblogs.com/Meanwey/p/9788713.html Python staticmethod...() 函数 https://www.runoob.com/python/python-func-staticmethod.html 4.Queue 队列 queue 模块实现多生产者,多消费者队列。
from tkinter import * # get widget classes from tk...
/usr/bin/python #coding=utf-8 if __name__ == '__main__': zi = int(input('输入一个数字:\n')) n1 = 1.../usr/bin/python #coding=utf-8 if __name__ == '__main__': a = 'Py' b = 'thon' c = a + b.../usr/bin/python #coding=utf-8 if __name__ == '__main__': class student: x = 0 c.../usr/bin/python #coding=utf-8 if __name__ == '__main__': n = 1 while n <= 7: a = int.../usr/bin/python #coding=utf-8 from sys import stdout if __name__ == '__main__': a = int(input('输入四个数字
#本人的运行环境为python3.7 count = 0 for i in range(1,5): for j in range(1,5): for k in range(1,5...#python3.7 I = int(input("Please enter the current month's profit:")) arr = [1000000, 600000, 400000...#python3.7 for i in range(1,85): if 168 % i ==0: j = 168 / i if i > j and (i + j...程序分析:以3月5日为例,应该先把前两个月的加起来,然后再加上5天即本年的第几天,特殊情况,闰年且输入月份大于2时需考虑多加一天 #python3.7 year = int(input('Year:'...例:http://www.runoob.com/python/python-100-examples.html
想到用python发送邮件 主要是服务器 有时候会产生coredump文件 ,然后因为脚本重启原因,服务器coredump产生后会重启 但是没有主动通知开发人员 想了下可以写个脚本一旦产生coredump...它的所有参数都是可选的,其中host参数表示smtp服务器主机名,上面例子中的smtp主机 为"smtp.yeah.net";port表示smtp服务的端口,默认是25;如果在创建SMTP对象的时候提供了这两个参数...下面的例子完全通过调用docmd方法向服务器发送指令来实现邮件的发送(在smtp.yeah.net邮件服务器上试验通过。...在上面的例子中,msg的值为: '''''From: from@yeah.net To: to@21cn.com Subject: test...不 用担心,python已经考虑到了这点,它为我们提供了email模块,使用该模块可以轻松的发送带图片、视频、附件等复杂内容的邮件。
import requests import json url = 'https://www.vivo.com/store/shops' headers = ...
#python3.7 from sys import stdout if __name__ == '__main__': a = [] for i in range(10):...#python3.7 sStr1 = 'language' sStr2 = 'age' print(sStr1.find(sStr2)) 结果: 5 63、使用Tkinter画椭圆。...#python3.7 from tkinter import * if __name__ == '__main__': x = 360 y = 160 top = y - 30...#python3.7 from tkinter import * if __name__ == '__main__': canvas = Canvas(width = 400, height...#python3.7 if __name__ == '__main__': n1 = int(input('n1 = \n')) n2 = int(input('n2 = \n'))
程序分析:演示一个python作用域使用方法。...#python3.7 class Num: nNum = 1 def inc(self): self.nNum += 1 print('nNum = %...#python3.7 X = [[12, 7, 3], [4, 5, 6], [7, 8, 9]] Y = [[5, 8, 1], [6, 7, 3], [4...#python3.7 TRUE = 1 FALSE = 0 def SQ(x): return x * x print('如果输入的数字小于50,程序将停止运行。')...#python3.7 def exchange(a, b): a, b = b, a return(a, b) if __name__ == '__main__': x =
需求1:Boss需要一个员工生产100个杯子,Boss一直等待员工生产完成之后方可 import threading import logging import...
程序分析:请参照程序Python 100例中的第14个例子 #python3.7 from sys import stdout for j in range(2, 1001): k = []...#python3.7 tour = [] height = [] sheight = 100.0#起始高度 tim = 10#次数 for i in range(1, tim + 1): if...#python3.7 x2 = 1 for day in range(9, 0, -1): x1 = (x2 + 1) * 2 x2 = x1 print(x1) 22、两个乒乓球队进行比赛...#python3.7 a = 2.0 b = 1.0 s = 0 for n in range(1,21): s += a / b t = a a = a + b b...= t print(s) 参考资料: Python 100例:http://www.runoob.com/python/python-100-examples.html
#python3.7 #适用于简单列表(即列表中都是基本的元素) a1 = [1,2] b1 = a1[:] print(b1) #不适合列表中包含列表的情况,如果要复制的列表中包含列表,只会复制那个列表的列表的引用...#python3.7 #左下三角格式输出九九乘法表 for i in range(1,10): for j in range(1,i+1): print('%d*%d=%d' %...#python3.7 import time #输出当前时间 print(time.strftime('%Y-%M-%D %H:%M:%S', time.localtime(time.time())...#python3.7 f1 = 1 f2 = 2 for i in range(1,22): print('%121d %121d' % (f1, f2)) if (i % 3) ==...100例:http://www.runoob.com/python/python-100-examples.html 2、将一个列表的数据复制到另一个列表中。
#python 3.7 if __name__ == '__main__': N = 10 print('请输入10个数字:\n') l = [] print...#python 3.7 if __name__ == '__main__': a = [] sum = 0.0 for i in range(3): a.append...#python 3.7 if __name__ == '__main__': #加入0作为占位符 a = [1, 4, 6, 9, 13, 16, 19, 28, 40, 100, 0...#python 3.7 if __name__ == '__main__': a = [9, 6, 5, 4, 1] N = len(a) print(a) for i...1 for i in range(3): print('The num = %d' % num) num += 1 autofunc() 参考资料: Python 100例
#python 3.7 a = ['one', 'two', 'three'] for i in a[::-1]: print(i) 33、按逗号分隔列表。...#python 3.7 L = [1, 2, 3, 4, 5] s = ','.join(str(n) for n in L) print(s) 34、练习函数调用。...#python 3.7 def hello_world(): print('hello world') def three_hellos(): for i in range(3):...#python 3.7 lower = int(input('输入区间最小值:')) upper = int(input('输入区间最大值:')) for num in range(lower, upper...: if (num % i) == 0: break else: print(num) 参考资料: 1、Python
#python3.7 if __name__ == '__main__': ptr = [] for i in range(5): num = int(input('Please...#python3.7 if __name__ == '__main__': a = [1, 2, 3] b = [3, 4, 5] a.sort() #对列表a进行排序...#python3.7 if __name__ == '__main__': for i in range(5): n = 0 if i !...#python3.7 def peven(n): i = 0 s = 0.0 for i in range(2, n + 1, 2): s += 1.0 / i...#python3.7 if __name__ == '__main__': person = {'Alice':13, 'Bob':35, 'May':56, 'Lin':29} m
/usr/bin/python3 import _thread import time # 为线程定义一个函数 def print_time( threadName, delay): count
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