import string

print(string.ascii_lowercase) #输出全部小写字母a-z

print(string.ascii_letters) #输出全部字母，包含小写a-z和大写A-Z

print(string.ascii_uppercase) #输出全部大写字母A-Z

print(string.digits) #输出数字0-9

print(string.punctuation) #输出所有标点符号

abcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ
ABCDEFGHIJKLMNOPQRSTUVWXYZ
0123456789
!"#$%&'()*+,-./:;<=>?@[\]^_`{|}~