Day 14 python 之 字符串练习
一、字符串总结与练习
1 #! /usr/bin/env python 2 # -*- coding: utf-8 -*- 3 # __author__ = "DaChao" 4 # Date: 2017/6/7 5 6 # x = "234567ASDsdfghj" #切片和索引 7 # print(x[2:-2]) 8 # print(x[2]) 9 10 # x = "hello" #显示字符串长度，注意是从1开始 11 # print(len(x)) 12 13 # x = "hello world ASDF" #返回长度为100的字符串，并在右侧填充0 14 # print(x.zfill(100)) 15 16 # x = "hello world ASDF" #小写变为大写 17 # print(x.upper()) 18 # x = "234567ASDsdfghj" #大写变为小写 19 # print(x.lower()) 20 # 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 21 # # print(x.islower()) 22 23 # x = "hello world" #返回标题化字符串 24 # print(x.title()) 25 26 # x = "Hello World" #翻转字符串中的大小写 27 # print(x.swapcase()) 28 29 # x = " hello world " #同时执行lstrip和rstrip，删除两边 30 # print(x.strip()) 31 32 # x = "hello world" #检测开头或结尾 33 # print(x.startswith('hea')) 34 # x = "hello world" 35 # print(x.endswith('o',0,5)) 36 37 # x = "234567ASDsd\nfASDghjASD" #以\n行分隔，返回一个包含元素的列表 38 # print(x.splitlines(True)) 39 40 # x = "234567ASDsdfASDghjASD" #以A分隔x，并可指定次数 41 # print(x.split('A',2)) 42 43 # x = "234567ASDsdfASDghjASD" #替换字符串，并且可指定次数 44 # print(x.replace('ASD','ABC',1)) 45 46 # x = "234567ASDsdfghj" #以7为中间符，分割x 47 # print(x.partition('7')) 48 49 # x = "234567ASDZzsdfghj" #返回x中最大的字母（小写） 50 # print((max(x))) 51 52 # x = "121 234567ASDsdfghj" #截掉x左边的1 53 # print(x.lstrip('1')) 54 55 # x = "234567sdfghj" #左对齐，并以*填充剩余数量（20） 56 # print(x.ljust(20,'*')) 57 58 # x = "*" #以x为分隔符重新生成y 59 # y = "abc" 60 # print(x.join(y)) 61 62 # x = "Asdf112321 Gh123J" #判断是否首字符为大写，其它为小写 63 # print(x.istitle()) 64 # x = " " #判断是否只包含空格 65 # print(x.isspace()) 66 # x = "234567f" #判断是否只包含*数字字符* 67 # print(x.isnumeric()) 68 # x = "234567" #判断是否全为数字 69 # print(x.isdigit()) 70 # x = "234567sdfghj" #判断是否全为十进制数字 71 # print(x.isdecimal()) 72 # x = "234567sdfghj" #判断是否全为字母 73 # print(x.isalpha()) 74 # x = "234567sdfghj" #判断是否全为字母或数字 75 # print(x.isalnum()) 76 77 # x = "hello world" #index同find，但查不到，会返回异常！！！ 78 # print(x.index('a')) 79 # x = "hello world" #find查找字符串并返回索引值 80 # print(x.find('d')) 81 82 # x = "name:{2},age:{1},sex:{0}" #format格式化字符串 83 # print(x.format('chao','18','male')) 84 # x = "name:{},age:{},sex:{}" 85 # print(x.format('chao','18','male')) 86 87 # x = "hello \tworld" #\t tab符号 88 # print(x.expandtabs(100)) 89 90 # x = "hello world" #在指定范围内，返回l的次数 91 # print(x.count('l',3,10)) 92 93 # x = "hello world" #中间插入字符串，两边填充* 94 # print(x.center(30,'*'))
二、作业及相关
1 #! /usr/bin/env python 2 # -*- coding: utf-8 -*- 3 # __author__ = "DaChao" 4 # Date: 2017/6/7 5 6 ''' 7 work8: 8 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）， 9 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 10 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 11 （如果用户名为alex则打印super user，如果用户名为yuanhao或者wupeiqi 12 则打印normal user，其余情况均打印unkown user），退出功能 13 3.要求用户输入退出，则退出所有循环（使用tag的方式） 14 15 16 运行效果如下： 17 user: egon 18 password: 123 19 work_mons: 12 20 salary: 10000 21 22 1 查询总工资 23 2 查询用户身份 24 3 退出登录 25 26 >>: 1 27 总工资是: 120000.0 28 29 1 查询总工资 30 2 查询用户身份 31 3 退出登录 32 33 >>: 2 34 unkown user 35 36 1 查询总工资 37 2 查询用户身份 38 3 退出登录 39 40 >>: 3 41 ''' 42 43 #work8 2 44 tag = True 45 46 while tag: 47 while tag: 48 user = input("Please input your username: ")#解决问题：用户名必须非空格和回车！！！ 49 if len(user) != 0 and not user.isspace(): 50 break 51 while tag: 52 password = input("Please input your password: ") 53 if len(password) != 0 and not password.isspace(): 54 break 55 workhours = input("Please input your work hours: ") 56 salary_m = input("Please input your monthly salary: ") 57 tag = workhours.isdigit() and salary_m.isdigit() 58 while tag: 59 print(" 1、查询总工资") 60 print(" 2、查询用户身份") 61 print(" 3、退出登录") 62 order = input("Please input your choose number: ") 63 # while order == "1" or "2" or "3": 64 if order == "1": #如果不按照惯性输入，怎么办？？ 65 print("总工资是： ",int(workhours)*int(salary_m)) #对输入数字取整数！！！ 66 elif order == "2": 67 if user == "alex": 68 print("*******Super user*******") 69 elif user == "yuanhao" or "wupeiqi": 70 print("*******Normal user*******") 71 else: 72 print("*******Unknown user*******") 73 elif order == "3": 74 print("*******用户已退出！*******") 75 tag = False 76 77 78 #work8 1 79 # tag = True 80 # 81 # while tag: 82 # user = input("Please input your username: ") #有个问题：直接回车也跳过指令！！！ 83 # password = input("Please input your password: ") 84 # jobtime = input("Please input your time of job: ") 85 # salary_m = input("Please input your monthly salary: ") 86 # tag = user.isspace() or password.isspace() or not jobtime.isdigit() or not salary_m.isdigit() 87 # while not tag: 88 # print(" 1、查询总工资") 89 # print(" 2、查询用户身份") 90 # print(" 3、退出登录") 91 # order = input("Please input your choose number: ") 92 # if order == "1": 93 # print("总工资是： ",int(jobtime)*int(salary_m)) 94 # elif order == "2": 95 # if user == "alex": 96 # print("Super user") 97 # elif user == "yuanhao" or "wupeiqi": 98 # print("Normal user") 99 # else: 100 # print("Unknown user") 101 # elif order == "3": 102 # print("用户已退出！") 103 # break 104 105 ''' 106 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 107 ''' 108 109 # tag = True 110 # while tag: 111 # content = input("Please input your content: ") 112 # tag = not content.startswith("alex") 113 # print(content,"SB") 114 115 ''' 116 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 117 ''' 118 119 # tag = True 120 # while tag: 121 # user = input("Please input your username: ") 122 # password = input("Please input your password: ") 123 # tag = user.isspace() or user.isdigit() 124 # print("You passed!") 125 126 ''' 127 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 128 ''' 129 130 # tag = True 131 # while tag: 132 # order = input("Please input your order: ") 133 # tag = order.isspace() 134 # print("You passed.") 135 136 ''' 137 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 138 ''' 139 140 # msg = '/etc/a.txt|365|get' 141 # print(msg.split('|')) 142 143 ''' 144 work3: msg='hello alex'中的alex替换成SB 145 ''' 146 147 # msg = 'hello alex' 148 # print(msg.replace("alex","SB")) 149 150 ''' 151 work2: 编写while循环，利用索引遍历出每一个字符 152 ''' 153 154 # w = "My daughter has some cartoon characters on her shirt." 155 # i = 0 156 # while i < len(w): 157 # print (w[i]) 158 # i+=1 159 160 161 ''' 162 work1：编写for循环，利用索引遍历出每一个字符 163 ''' 164 165 # w = "My daughter has some cartoon characters on her shirt." 166 # 167 # for i in range(0,len(w)): 168 # print(w[i])
