1、字符串首字母大寫
>>> name = "xiaoming"
>>> print(name.capitalize()) //capitalize方法可以使字符串首字母大寫
Xiaoming
2、統計字符串中字符的個數
>>> name = "xiaoming"
>>> print(name.count("i"))
2
3、重複打印某個字符
>>> print(name.center(20,"-")) //總共有20個字符，把"xiaoming"放在中間
------xiaoming------
4、判斷字符串以什麼結尾
>>> name = "xiaoming"
>>> print(name.endswith("ng"))
True
5、根據字符找索引位置
>>> name = "My name is Xiaoming"
>>> print(name.find("is")) //find只打印查找到的字符的開頭字母的位置
8
>>> print(name[name.find("is"):]) //字符串也支持切片
is Xiaoming
6、字符串格式化輸出
>>> name = "My name is {name} and I am {year} years old."
>>> print(name.format(name="Xiaoming",year=20)) //format格式化輸出
My name is Xiaoming and I am 20 years old.
>>> print(name.format_map( {"name":"Xiaoming","year":25} )) //format_map可以以字典的格式進行傳輸
My name is Xiaoming and I am 25 years old.
7、判斷字符串是不是純英文字符組成
>>> name = "abc"
>>> print(name.isalpha())
True
>>> name = "ab12"
>>> print(name.isalpha())
False
8、判斷數字是不是整數
>>> print("aa".isdigit())
False
>>> print("11".isdigit())
True
>>> print("11.2".isdigit())
False
9、判斷字符串是不是小寫
>>> name = "abc"
>>> print(name.islower())
True
>>> name = "My"
>>> print(name.islower())
False
10、判斷字符串中的字符開頭是不是大寫字母
>>> name = "my name"
>>> print(name.istitle())
False
>>> name = "My Name"
>>> print(name.istitle())
True
11、判斷字符串是不是全是大寫字母
>>> name = "MY NAME"
>>> print(name.isupper())
True
12、join的簡單使用
>>> print("".join(["1","2","3"]))
123
>>> print("+".join(["1","2","3"]))
1+2+3
13、ljust()和rjust()的使用
>>> name
'MY NAME'
>>> print(name.ljust(20,"*")) //注意：是整個字符串共長20，"MY NAME"共長7，所以"*"只有13個
MY NAME*************
>>> print(name.rjust(20,"*"))
*************MY NAME
14、字符串的大小寫轉換
>>> name
'MY NAME'
>>> print(name.lower()) //lower是把大寫變成小寫
my name
>>> print(name.upper()) //upper是把小寫轉換爲大寫
MY NAME
15、去除字符串兩頭的回車或者空格
>>> print("\nMy name")
My name
>>> print("\nMy name".lstrip()) //lstrip爲去除字符串左邊的空格或回車
My name
>>> print("My name\n")
My name
>>> print("My name\n".rstrip()) //rstrip爲去除字符串右邊的空格或回車
My name
>>> print("\nMy name\n".strip()) //strip爲去除兩頭的空格或回車
My name
16、字符的替換
>>> print("abca".replace("a","L")) //默認爲全部替換
LbcL
>>> print("abca".replace("a","L",1)) //可以指定
Lbca
17、字符串分割成列表
>>> print("My name is Xiaoming".split()) //默認爲空格
['My', 'name', 'is', 'Xiaoming']
>>> print("My name is Xiaoming".split("i")) //可以指定分隔符
['My name ', 's X', 'aom', 'ng']
18、swapcase，把字符串中的小寫轉大寫，大寫轉小寫
>>> print("My name is".swapcase())
mY NAME IS