string 模块：字符串处理

import string

string.punctuation

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

print string.letters
print string.ascii_letters

ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ

print string.ascii_lowercase
print string.lowercase

print string.ascii_uppercase
print string.uppercase

abcdefghijklmnopqrstuvwxyz
abcdefghijklmnopqrstuvwxyz
ABCDEFGHIJKLMNOPQRSTUVWXYZ
ABCDEFGHIJKLMNOPQRSTUVWXYZ

print string.lower

<function lower at 0x7efda4f2ae60>

string.digits

'0123456789'

string.hexdigits

'0123456789abcdefABCDEF'

string.capwords("this is a big world")

'This Is A Big World'

string.center("test", 20)

'        test        '