[Python] 字符串操作

Posted 2021-02-20 itkeyan

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:UsersAdministratorAppDataLocalProgramsPythonPython37python.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:UsersAdministratorAppDataLocalProgramsPythonPython37python.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:UsersAdministratorAppDataLocalProgramsPythonPython37python.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:UsersAdministratorAppDataLocalProgramsPythonPython37python.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:UsersAdministratorAppDataLocalProgramsPythonPython37python.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:UsersAdministratorAppDataLocalProgramsPythonPython37python.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:UsersAdministratorAppDataLocalProgramsPythonPython37python.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:UsersAdministratorAppDataLocalProgramsPythonPython37python.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