python字符串string的内置方法实例详解

下面给大家分享python 字符串string的内置方法，具体内容详情如下所示：

#__author: "Pizer Wang"
#__date: 2018/1/28
a = "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 = "!@#$"
d = a + b + c
print(d)
d = "".join([a, b, c])
print(d)
d = ", ".join([a, b, c])
print(d)
d = "++".join([a, b, c])
print(d)
print("-------------------")
print("string的内置方法")
str = "helloworld"
print(str.count("l"))   #统计元个数
print(str.capitalize())   #首字母大写
print(str.center(25, "-"))  #居中
print(str.endswith("d"))
print(str.endswith("world"))
print(str.endswith("word"))  #是否以某个内容结尾
print(str.startswith("hello")) #是否以某个内容开始
str = "hello\tworld"
print(str.expandtabs(tabsize=10))
print("-------------------")
str = "helloworld {name} is {age}"
print(str.find("w"))   #查找到第一个元素并将索引值返回
print(str.format(name = "Pizer", age = 18))
print(str.format_map({"name":"Jone", "age":25}))
print("-------------------")
print(str.index("w"))
#print(str.index("www"))  #报错
print(str.find("wwww"))
print("-------------------")
str = "123abc"
print(str.isalnum())
str = "123"
print(str.isalnum())
str = "abc"
print(str.isalnum())
str = "!@$"
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))

执行结果:

Let's go
Let's go
hellohellohello
lloworld
True
Pizer is a good student
Pizer is a goog student
1234abcd!@#1234abcd!@#
1234abcd!@#
 1234, abcd, !@#$
1234++abcd++!@#$
string的内置方法
3
 Helloworld
――Chelloworld――-
True
 True
 False
 True
hello world
5
 helloworld Pizer is 18
helloworld Jone is 25
5
-1
True
 True
 True
 False
True
True
 False
 True
 False
False
False
 True
 True
 False
 True
True
True
False
hello jone
 GOOD MORNING
hELLO jONE
Hello world―――
 ―――Hello world
 Hello world
Hello world
 Hello world
 Hello world
Hello Pizer Pizer
 Hello Pizer Jone
 3
5
[‘Hello', ‘world']
 [‘He', ‘lo world']
 [‘Hello wor', ‘d']
Hello Jone

总结