python之string预定义模块

#_*_ coding:utf-8 _*_
import string
print string.uppercase
#output ABCDEFGHIJKLMNOPQRSTUVWXYZ
print string.lowercase
#output abcdefghijklmnopqrstuvwxyz
print string.digits
#output 0123456789
print string.letters
#output abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ