python字符串string的内置方法实例详解

#__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："external nofollow" href="mailto:1234abcd!@#1234abcd">1234abcd!@#1234abcd!@#

1234abcd!@#

 1234, abcd, !@#$

1234++abcd++!@#$

string的内置方法 

3 

 Helloworld 

——–helloworld——- 

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
以上所述是小编给大家介绍的python字符串string的内置方法实例详解，希望对大家有所帮助，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对网站的支持！