python3之字符串常用操作练习补充二，,字符串常用操作练习补

python3之字符串常用操作练习补充二，,字符串常用操作练习补

字符串常用操作练习补充二

  1 #coding:utf-8  2   3 #***将"\t"转为空白符，默认使各段字符串长度为8的整数倍，指定长度则以指定的长度为准  4 str1 = "\tThis\tis Tab test\t!"  5 print(str1.expandtabs())  6 ‘‘‘  7 输出结果为：  8          This    is Tab test     !  9 |8字符   |8字符   |16字符         |! 10 ‘‘‘ 11 print(16*"*") 12  13  14 #***查找字符串出现的位置 15 #find和index的区别为查找不到内容时index直接抛异常报错，find返回-1 16 #print(str2.index("lee")) 17 str2 = "This is find test,do you not how to use find?" 18 start1 = 0 19 while True: 20     index1 = str2.find("find",start1+len("find"),len(str2)-1) 21     if index1 != -1: 22         print(index1) 23         start1 = index1 24     else: 25         print("查找结束") 26         break 27  28 #***字符串的格式化拼接 29 str3 = "My name is {0},I‘m {1}" 30 str4 = str3.format("Lee",30) 31 print(str4) 32 #两种拼接方法都是可以的，都比“+”的字符串拼接好 33 str5 = "Are you %s?" 34 str6 = str5 %("LiNing") 35 print(str6) 36 #这种方法让我想起了JSP 37 str7 = "His name is {name},he is {age}." 38 str8 = str7.format(name = "Daming",age = 28) 39 #和上面的类似，直接做成字典传入 40 str9 = str7.format_map({"name":"Jesson","age":18}) 41 print(str8) 42 print(str9) 43  44 print(16*"*") 45 #***字符串的各种判断 46 #是否为数字或字母，isalnum 47 print("aA".isalnum())   #True 48 print("5".isalnum())    #True 49 print("$".isalnum())    #False 50 print("Ⅴ".isalnum())    #True 51 #是否是数字0-9，isdigit 52 print() 53 print("aA".isdigit())   #False 54 print("5".isdigit())    #True 55 print("#".isdigit())    #False 56 print("Ⅵ".isdigit())    #False 57 #是否是数字isnumerice 58 print() 59 print("aA".isnumeric()) #False 60 print("5".isnumeric())  #True 61 print("^".isnumeric())  #False 62 print("Ⅵ".isnumeric())  #True 63 #是否为字母isalpha,a~z和A~Z为True 64 print() 65 print("a!dC".isalpha()) #False 66 print("AS".isalpha()) 67 #是否是十进制小数isdecimal 68  69 #是否为小写islower 70  71 #是否为大写isupper 72  73 #是否为空格isspace 74 print() 75 print("\t".isspace())   #True 76 print(" ".isspace())    #True 77  78 #是否为标题istitle 79  80 print(16*"*") 81  82 #***分隔符的操作 83 list1 = ["E","x","c","e","p","t","i","o","n"] 84 print("".join(list1))       #Exception 85 print("-".join(list1))      #E-x-c-e-p-t-i-o-n 86  87 print(16*"*") 88 #***左右填充 89 print("253".ljust(12,"$")) 90 print("253".rjust(12,"$")) 91 list2 = ["251","5","35","4567"] 92 #数据靠右对齐 93 for val in list2: 94     print(val.rjust(6," ")) 95  96 print(16*"*") 97 #***只去除左边/右边的空格 98 #lstrip()/rstrip() 99 100 #字符串的对应表101 intab = "abcde"102 outab = "12345"103 #将abcde对照为12345104 trantab = str.maketrans(intab,outab)105 str10 = "adagsdjfglamxcvb"106 #利用对照表trantab对str10进行字符替换107 str11 = str10.translate(trantab)108 print(str11)        #141gs4jfgl1mx3v2109 110 print(8*"*")111 #***字符串的分割112 print()113 str12 = "My name is Lee"114 print(str12.partition("is"))115 #print(str12.rpartition("is"))116 117 #字符串的替换，转换个数2可选118 print(str12.replace("e","8",2))119 120 print(16*"*")121 print()122 #888根据行进行分割，注意，第一行前面有一个回车符，也算一行，相当于lines.split("\n")123 lines = ‘‘‘124 This is first line.125 This is second line.126 This is third line.127 ‘‘‘128 print(lines.splitlines())129 #输出结果：[‘‘, ‘This is first line.‘, ‘This is second line.‘, ‘This is third line‘]130 131 print(16*"*")132 print()133 #大小写转换134 print("aBcD".swapcase())       #AbCd135 136 #转为标题，所有单词首字母大写137 print("This is a title".title())    #This Is A Title

python3之字符串常用操作练习补充二