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cd …返回上一级目录

# -*- codeing = utf-8 -*- # @Time : 2021/6/16 9:10 # @Author :ymx # @File : 古诗.py # @Software: PyCharm f = open("gushi.txt","w",encoding="utf-8") f.write("故人西辞黄鹤楼，烟花三月下扬州。孤帆远影碧空尽，唯见长江天际流。") f.close() #定义函数 def du(): f = open("gushi.txt", "r", encoding

# -*- codeing = utf-8 -*- # @Time : 2021/6/14 11:03 # @Author :ymx # @File : 函数.py # @Software: PyCharm ''' #函数的定义 def printinfo(): print("---------------------") print("人生苦短，我用Python") print("---------------------") #函数的调用 printinfo() ''' '

tuple的元素不能修改

# -*- codeing = utf-8 -*- # @Time : 2021/5/30 11:40 # @Author :ymx # @File : 商品列表.py # @Software: PyCharm import sys products = [["iphone",6888],["Macpro",14800],["小米6",2499],["Coffee",31],["Book",60],["Nike",699]] print("------\t商品列表\t------") i = 0 while

# -*- codeing = utf-8 -*- # @Time : 2021/5/28 19:03 # @Author :ymx # @File : 字符串.py # @Software: PyCharm ''' word = '字符串' sentence = "这是一个句子" paragraph = """ 这是一个段落 可以由多行组成 """ print(word) print(sentence) print(paragraph) ''' ''' my_srt =

# -*- codeing = utf-8 -*- # @Time : 2021/5/26 14:52 # @Author :ymx # @File : rock-paper-scissors.py # @Software: PyCharm import random #引入随机库 while True: shuru = int(input("请输入：剪刀（0）、石头（1）、布（2）：")) while shuru>2 or shuru<0: print("输入

import pygame, sys, random, time from pygame.locals import * # 从pygame模块导入常用的函数和常量 # 定义颜色变量 black_colour = pygame.Color(0, 0, 0) white_colour = pygame.Color(255, 255, 255) red_colour = pygame.Color(255, 0, 0) grey_colour = pygame.Color(150, 150, 150) #

# -*- codeing = utf-8 -*- # @Time : 2021/5/28 18:13 # @Author :ymx # @File : 九九乘法表.py # @Software: PyCharm i = 1 while i <=9: for j in range(1,i+1): print("%d*%d=%d"%(i,j,i*j),end="\t") print("\n") i +=1

# -*- codeing = utf-8 -*- # @Time : 2021/5/28 15:10 # @Author :ymx # @File : 循环.py # @Software: PyCharm ''' for i in range(5): print(i) ''' ''' for i in range(0,10,3): #从0开始到10结束，步进值为3 print(i) ''' ''' for i in range(-10,-100,-30): print(i)

-- codeing = utf-8 -- @Time : 2021/5/24 20:34 @Author :ymx @File : 条件判断.py @Software: PyCharm ‘’’ if True: print(“True”) #注意缩进 else: print(“False”) print(“end”) score = 80 if score >=90 and score <=100: print(“本次考试，等级为A”) elif score >=80 and

-- codeing = utf-8 -- @Time : 2021/5/23 23:37 @Author :ymx @File : 基础输出.py @Software: PyCharm ‘’’ print(“标准化输出字符串”) a = 10 print(a) print(“这是变量:”,a) #变量可以是任意的数据类型，在程序中用一个变量名表示 #变量名必须是大小写英文、数学和下划线(_)的组合，且不能以数字开头 import keyword keyword.kwlist #python环境编写&gt

1 import requests url = “https://www.amazon.cn/” try: r = requests.get(url) r.raise_for_status() r.encoding = r.apparent_encoding print(r.text[:1000]) print(“爬取成功”) except: print(“爬取失败”) 2 import requests url = “https://www.amazon.cn/” try: kv = {‘user-age

常用请求头信息 User-Agent：请求载体的身份标识 Connection：请求完毕后，是断开连接还是保持连接 常用响应头信息 Content-Type：服务器响应客户端的数据类型