Day 14 python 之 字符串练习

一、字符串总结与练习

 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 # __author__ = "DaChao"
 # Date: 2017/6/7

 # x = "234567ASDsdfghj"  #切片和索引
 # print(x[2:-2])
 # print(x[2])

 # x = "hello"     #显示字符串长度，注意是从1开始
 # print(len(x))

 # x = "hello world ASDF"  #返回长度为100的字符串，并在右侧填充0
 # print(x.zfill(100))

 # x = "hello world ASDF"  #小写变为大写
 # print(x.upper())
 # x = "234567ASDsdfghj"  #大写变为小写
 # print(x.lower())
 # x = "234567sdfghj"  #判断是否含有至少一个区分大小写的字符，并且这些都是小写
 # # print(x.islower())

 # x = "hello world"   #返回标题化字符串
 # print(x.title())

 # x = "Hello World"   #翻转字符串中的大小写
 # print(x.swapcase())

 # x = "     hello world     "     #同时执行lstrip和rstrip，删除两边
 # print(x.strip())

 # x = "hello world"   #检测开头或结尾
 # print(x.startswith('hea'))
 # x = "hello world"
 # print(x.endswith('o',0,5))

 # x = "234567ASDsd\nfASDghjASD"  #以\n行分隔，返回一个包含元素的列表
 # print(x.splitlines(True))

 # x = "234567ASDsdfASDghjASD"  #以A分隔x，并可指定次数
 # print(x.split('A',2))

 # x = "234567ASDsdfASDghjASD"  #替换字符串，并且可指定次数
 # print(x.replace('ASD','ABC',1))

 # x = "234567ASDsdfghj"  #以7为中间符，分割x
 # print(x.partition('7'))

 # x = "234567ASDZzsdfghj"  #返回x中最大的字母（小写）
 # print((max(x)))

 # x = "121   234567ASDsdfghj"  #截掉x左边的1
 # print(x.lstrip('1'))

 # x = "234567sdfghj"  #左对齐，并以*填充剩余数量（20）
 # print(x.ljust(20,'*'))

 # x = "*"  #以x为分隔符重新生成y
 # y = "abc"
 # print(x.join(y))

 # x = "Asdf112321 Gh123J"  #判断是否首字符为大写，其它为小写
 # print(x.istitle())
 # x = "  "  #判断是否只包含空格
 # print(x.isspace())
 # x = "234567f"  #判断是否只包含*数字字符*
 # print(x.isnumeric())
 # x = "234567"  #判断是否全为数字
 # print(x.isdigit())
 # x = "234567sdfghj"  #判断是否全为十进制数字
 # print(x.isdecimal())
 # x = "234567sdfghj"  #判断是否全为字母
 # print(x.isalpha())
 # x = "234567sdfghj"  #判断是否全为字母或数字
 # print(x.isalnum())

 # x = "hello world"   #index同find，但查不到，会返回异常！！！
 # print(x.index('a'))
 # x = "hello world"   #find查找字符串并返回索引值
 # print(x.find('d'))

 # x = "name:{2},age:{1},sex:{0}"  #format格式化字符串
 # print(x.format('chao','18','male'))
 # x = "name:{},age:{},sex:{}"
 # print(x.format('chao','18','male'))

 # x = "hello \tworld"   #\t tab符号
 # print(x.expandtabs(100))

 # x = "hello world"    #在指定范围内，返回l的次数
 # print(x.count('l',3,10))

 # x = "hello world"    #中间插入字符串，两边填充*
 # print(x.center(30,'*'))

字符串总结及练习

二、作业及相关

 #! /usr/bin/env python
 # -*- coding: utf-8 -*-
 # __author__ = "DaChao"
 # Date: 2017/6/7

 '''
 work8:
 1.两层while循环，外层的while循环，让用户输入用户名、密码、工作了几个月、每月的工资（整数），
 用户名或密码为空，或者工作的月数不为整数，或者月工资不为整数，则重新输入
 2.认证成功，进入下一层while循环，打印命令提示，有查询总工资，查询用户身份
 （如果用户名为alex则打印super user，如果用户名为yuanhao或者wupeiqi
 则打印normal user，其余情况均打印unkown user），退出功能
 3.要求用户输入退出，则退出所有循环（使用tag的方式）

 运行效果如下：
 user: egon
 password: 123
 work_mons: 12
 salary: 10000

             1 查询总工资
             2 查询用户身份
             3 退出登录

 >>: 1
 总工资是: 120000.0

             1 查询总工资
             2 查询用户身份
             3 退出登录

 >>: 2
 unkown user

             1 查询总工资
             2 查询用户身份
             3 退出登录

 >>: 3
 '''

 #work8 2
 tag = True

 while tag:
     while tag:
         user = input("Please input your username: ")#解决问题：用户名必须非空格和回车！！！
         if len(user) != 0 and not user.isspace():
             break
     while tag:
         password = input("Please input your password: ")
         if len(password) != 0 and not password.isspace():
             break
     workhours = input("Please input your work hours: ")
     salary_m = input("Please input your monthly salary: ")
     tag = workhours.isdigit() and salary_m.isdigit()
     while tag:
         print("         1、查询总工资")
         print("         2、查询用户身份")
         print("         3、退出登录")
         order = input("Please input your choose number: ")
 #        while order == "1" or "2" or "3":
         if order == "":    #如果不按照惯性输入，怎么办？？
             print("总工资是： ",int(workhours)*int(salary_m))    #对输入数字取整数！！！
         elif order == "":
             if user == "alex":
                 print("*******Super user*******")
             elif user == "yuanhao" or "wupeiqi":
                 print("*******Normal user*******")
             else:
                 print("*******Unknown user*******")
         elif order == "":
             print("*******用户已退出！*******")
             tag = False

 #work8 1
 # tag = True
 #
 # while tag:
 #     user = input("Please input your username: ")    #有个问题：直接回车也跳过指令！！！
 #     password = input("Please input your password: ")
 #     jobtime = input("Please input your time of job: ")
 #     salary_m = input("Please input your monthly salary: ")
 #     tag = user.isspace() or password.isspace() or not jobtime.isdigit() or not salary_m.isdigit()
 #     while not tag:
 #         print("         1、查询总工资")
 #         print("         2、查询用户身份")
 #         print("         3、退出登录")
 #         order = input("Please input your choose number: ")
 #         if order == "1":
 #             print("总工资是： ",int(jobtime)*int(salary_m))
 #         elif order == "2":
 #             if user == "alex":
 #                 print("Super user")
 #             elif user == "yuanhao" or "wupeiqi":
 #                 print("Normal user")
 #             else:
 #                 print("Unknown user")
 #         elif order == "3":
 #             print("用户已退出！")
 #             break

 '''
 work7: 编写while循环，让用户输入内容，判断输入的内容以alex开头的，则将该字符串加上_SB结尾
 '''

 # tag = True
 # while tag:
 #     content = input("Please input your content: ")
 #     tag = not content.startswith("alex")
 # print(content,"SB")

 '''
 work6: 编写while循环，让用户输入用户名和密码，如果用户为空或者数字，则重新输入
 '''

 # tag = True
 # while tag:
 #     user = input("Please input your username: ")
 #     password = input("Please input your password: ")
 #     tag = user.isspace() or user.isdigit()
 # print("You passed!")

 '''
 work5: 编写while循环，要求用户输入命令，如果命令为空，则继续输入
 '''

 # tag = True
 # while tag:
 #     order = input("Please input your order: ")
 #     tag = order.isspace()
 # print("You passed.")

 '''
 work4: msg='/etc/a.txt|365|get' 将该字符的文件名，文件大小，操作方法切割出来
 '''

 # msg = '/etc/a.txt|365|get'
 # print(msg.split('|'))

 '''
 work3: msg='hello alex'中的alex替换成SB
 '''

 # msg = 'hello alex'
 # print(msg.replace("alex","SB"))

 '''
 work2: 编写while循环，利用索引遍历出每一个字符
 '''

 # w = "My daughter has some cartoon characters on her shirt."
 # i = 0
 # while i < len(w):
 #     print (w[i])
 #     i+=1

 '''
 work1：编写for循环，利用索引遍历出每一个字符
 '''

 # w = "My daughter has some cartoon characters on her shirt."
 #
 # for i in range(0,len(w)):
 #     print(w[i])

作业及相关