python字符串string的内置方法实例详解

#__author: "Pizer Wang"#__date: 2018/1/28a = "Let's go"print(a)print("-------------------")a = 'Let/'s go'print(a)print("-------------------")print("hello" * 3)print("helloworld"[2:])print("-------------------")print("ell" in "helloworld")print("-------------------")print("Pizer is a good student")print("%s is a goog student" % "Pizer")print("-------------------")a = "1234"b = "abcd"c = "!@#$"d = a + b + cprint(d)d = "".join([a, b, c])print(d)d = ", ".join([a, b, c])print(d)d = "++".join([a, b, c])print(d)print("-------------------")print("string的内置方法")str = "helloworld"print(str.count("l"))   #统计元个数print(str.capitalize())   #首字母大写print(str.center(25, "-"))  #居中print(str.endswith("d"))print(str.endswith("world"))print(str.endswith("word"))  #是否以某个内容结尾print(str.startswith("hello")) #是否以某个内容开始str = "hello/tworld"print(str.expandtabs(tabsize=10))print("-------------------")str = "helloworld {name} is {age}"print(str.find("w"))   #查找到第一个元素并将索引值返回print(str.format(name = "Pizer", age = 18))print(str.format_map({"name":"Jone", "age":25}))print("-------------------")print(str.index("w"))#print(str.index("www"))  #报错print(str.find("wwww"))print("-------------------")str = "123abc"print(str.isalnum())str = "123"print(str.isalnum())str = "abc"print(str.isalnum())str = "!@$"print(str.isalnum())str = "中国万岁"print(str.isalnum())print("-------------------")print("123456".isdecimal())print("123456ff".isdecimal())print("123456789".isdigit())print("12345.6789".isdigit())print("12345.6789".isnumeric())print("-------------------")print("34abc".isidentifier())print("_34abc".isidentifier())print("abc".islower())print("abC".islower())print("ABC".isupper())print(" ".isspace())print("-------------------")print("Hello Jone".istitle())print("Good morning".istitle())print("-------------------")print("Hello Jone".lower())print("Good morning".upper())print("Hello Jone".swapcase())print("-------------------")print("Hello world".ljust(20, "-"))print("Hello world".rjust(20, "-"))print(" Hello world /t /n")print(" Hello world ".strip())print(" Hello world ".lstrip())print(" Hello world ".rstrip())print("-------------------")print("Hello Jone Jone".replace("Jone", "Pizer"))print("Hello Jone Jone".replace("Jone", "Pizer", 1))print("My title".find("t"))print("My title".rfind("t"))print("-------------------")print("Hello world".split(" "))print("Hello world".split("l", 1))print("Hello world".rsplit("l", 1))print("hello jone".title())print("-------------------")#重要的字符串方法# print(st.count('l'))# print(st.center(50,'#')) # 居中# print(st.startswith('he')) # 判断是否以某个内容开头# print(st.find('t'))# print(st.format(name='alex',age=37)) # 格式化输出的另一种方式 待定：?:{}# print('My tLtle'.lower())# print('My tLtle'.upper())# print('/tMy tLtle/n'.strip())# print('My title title'.replace('itle','lesson',1))# print('My title title'.split('i',1))