一、模块初始
import sys
print(sys.path)#打印python的环境
print（sys.argv）#打印相对路径
print（sys.argv【2】）#打印对应的变量
import os
cmd = os.system("dir")
print(cmd)
os.mkdir('new_dir')
#第三方库
在同一目录下或在lib/site-package下可直接import，其他情况下需写路径
import
数据运算：
3/2 ==1
5%2 ==1返回余数
！=
<>
8bit =byte
1024byte=1kbyte
1024kbyte=1mbyte
1024mb=1gb
2014gb=1T
& | ^（异或运算） ~（反转） >>右移 <<左移
str和二进制的转换
列表的操作
names = ['zhangyang','guyun','xiangpeng','xuliangchen']print(names)print(names[0],names[2])print(names[0:2])#切片，顾头不顾尾print(names[0:])print(names[-1])print(names[-3:])names.append("leihaidong")names.insert(1,'chenronghua')names.insert(3,'xinzhiyun')names[2]='xiedi'#names.pop(2)names.remove('chenronghua')del names[1]names.pop()#删除最后一个print(names.index('xiedi'))print(names[names.index('xiedi')])print(names.count('xiedi'))names.clear()names.reverse()#反转names.sort()#排序names1=[1,2,3,4]names.extend(names1)names2 = names.copy()#浅copynames[1]= 'sd'print(names,names2)#names变了，names2不变#但是names还有一层的话，都变import copynames3 = copy.copy(names)names3 = copy.deepcopy(names)for i in range(1,10,2): print(i)对浅copy的补充
import copyperson = ['name',['saving',100]]p1= copy.copy(person)p2= person[:]#也是浅copyp3= list(person)p1=person[:]p2=person[:]p1[0]='alex'p2[1]='angal'#tuple#它只有两个方法：count、indexshopping_car.py #! usr/bin/env python# encoding:utf-8# __author__="Macal"product_list = [ ('iphone', 5800), ("Starbuck Latte", 31), ("Alex python", 20), ('bike', 800), ('coffee', 30)]shopping_list=[]salary = input("Input your salary:")if salary.isdigit(): salary = int(salary) while True: for index,item in enumerate(product_list): print(index,item) user_choice = input("选择要买什么？") if user_choice.isdigit() : user_choice = int(user_choice) if user_choice < len(product_list) and user_choice >=0: P_item = product_list[user_choice] if P_item[1] <=salary:#买得起 shopping_list.append(P_item) salary -= P_item[1] print("Add %s into shopping cart,your current balance is \033[31;1m%s\033[0m" %(P_item,salary)) else: print('your current balance is not enough!') else: print('product code %s is not exist' %user_choice) elif user_choice=='q': print('----------shopping list----------') for p in shopping_list: print(p) print('Your balance:',salary) exit()转载于:https://www.cnblogs.com/Macal/p/6754661.html
