1 #判断 是不是 字母和数字
2 a = "abc9"
3 print(a.isalnum())
4
5 #判断 是否 都是 字母
6 a = "abc"
7 print(a.isalpha())
8
9
10 #判断 是否 都是 数字
11 a = "9999"
12 print(a.isdigit())
13
14 #判断 是否 都是 小写
15 a = "alex"
16 print(a.islower())
17
18 #判断 是否 都是 空格
19 a = " "
20 print(a.isspace())
21
22 #判断 是不是 标题
23 a = "Alex"
24 print(a.istitle())
25
26 #判断 是不都是 大写
27 a = "ALEX"
28 print(a.isupper())
29
30 #左对齐，右侧填充
31 a = "alex"
32 print(a.ljust(20,"*"))
33
34
35 #右对齐，左侧填充
36 a = "alex"
37 print(a.rjust(20,"*"))
38
39 # 把字符串变小写
40 a = "ALEX_ERIC"
41 print(a.lower())
42
43 # 移除左侧的空格
44 a = " alex "
45 print(a.lstrip())
46
47 # 移除右侧的空格
48 a = " alex "
49 print(a.rstrip())
50
51 # 移除两侧的空格
52 a = " alex "
53 print(a.strip())
