[Python] 字符串操作

字符串操作

以下字符串可以  变量.函数()    也可以   "字符串".函数()

capitalize()

首字母大写，其余转换为小写

print("test TEST".capitalize())

输出

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python.exe D:/Python/Day02/test.py
Test test

Process finished with exit code 0

 count()

 count("str")，统计字符串出现的次数，跟列表的用法一样

print("test test".count("t"))

输出

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python.exe D:/Python/Day02/test.py
4

Process finished with exit code 0

 center()

center(number,"str") 让内容显示在中间，使内容两侧填充字符串，默认是空格

print("test".center(50,"-"))

输出

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python.exe D:/Python/Day02/test.py
-----------------------test-----------------------

Process finished with exit code 0

endswith()

 endswith("str")，判断字符串结尾是否包含 “str“，是则True 否则False

print("i am shuaige".endswith("ge"))

输出

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python.exe D:/Python/Day02/test.py
True

Process finished with exit code 0

 find()

find("str") 查找字符串并返回索引值，如果不存在则返回 -1

print("i am shuaige".find("am"))

输出

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python.exe D:/Python/Day02/test.py
2

Process finished with exit code 0

format_map()

和format用法一样，字符格式化。只是格式不一样

print("my name is {name} i am {age} years old".format_map({"name":"DaHua","age":10}))

输出

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python.exe D:/Python/Day02/test.py
my name is DaHua i am 10 years old

Process finished with exit code 0

isalnum()

str.isalnum()  检查字符串是否仅为字母、数字，或者为字母数字混合，是则返回 True，否则返回 False

print("test123".isalnum())

输出

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python.exe D:/Python/Day02/test.py
True

Process finished with exit code 0

isalpha()

str.alpha() 检查字符串是否为字母，是则返回True，否则返回False

print("abc".isalpha())

输出

C:\Users\Administrator\AppData\Local\Programs\Python\Python37\python.exe D:/Python/Day02/test.py
True

Process finished with exit code 0

isdecimal()

str.isdecimal() 检查字符串是否只为十六进制

print("000000".isdecimal())

输出