1 常用：分割、长度、索引、切片
2 r = (1,2,3,4,5)#只读列表元组
3 name = "liangml"
4 strip
5 username = input("user:")
6 if username.strip() == "liangml":#strip可以将输入前后的空格都换掉
7 print("welcome")
8
9 split
10 names = "liangml","tom","jack"
11 name2 = names.split(",")#split是names拆分开来（得到一个列表）
12 print("|".join(name2))#join是将name2结果以|形式合并到一起
13
14 print("" in name)#有没有空格
15
16 capitalize
17 print(name.capitalize())#capitalize是将名字的首字母大写
18
19 format
20 #format字符串两种赋值方式
21 msg = "Hello,{name},It's been a long {age} since last time sopke...."
22 #msg2 = msg.format(name="zhangsan",age=111)
23 #print(msg2)
24 msg2 = "lisi{0},dddd{1}"
25 print(msg2.format("liangml",22))
26
27 center
28 print(name[2:4])
29 print(name.center(40,"-"))#center可以指定长度,将字符串两边的长度均匀的分开
30
31 find
32 print(name.find("a"))#find查找赋值中有几个包含字符串
33
34 isdigit
35 age = input("your age:")
36 if age.isdigit():#isdigit判断他是否为数字
37 age = int(age)
38 else:
39 print("invalid data type")
40
41 isalnum
42 name = "liangml!dfs"
43 print(name.isalnum())#不容许复制里面有特殊字符
44
45 endswith、startswith
46 print(name.endswith("dfsd"))
47 print(name.startswith("dfsfds"))
48
49 upper、lower
50 print(name.upper().lower())#upper赋值全部大写，lower全部变小
