Python tuple方法和string常量介绍

>>> tp = tuple([1, 2, 3, 4, 4, 5])
>>> tp.count(1)
1
>>> tp.count(4)
2
>>> tp.count(7)
0

>>> tp = tuple([1, 2, 3, 4, 4, 5])
>>> tp.index(4)
3
>>> tp.index(7)
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
ValueError: tuple.index(x): x not in tuple

>>> import string
>>> string.ascii_letters
'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ'
>>> 'a' in string.ascii_letters
True
>>> '你好' in string.ascii_letters
False

>>> import string
>>> string.ascii_lowercase
'abcdefghijklmnopqrstuvwxyz'

>>> import string
>>> string.ascii_uppercase
'ABCDEFGHIJKLMNOPQRSTUVWXYZ'

>>> import string
>>> string.digits
'0123456789'

>>> import string
>>> string.hexdigits
'0123456789abcdefABCDEF'

>>> import string
>>> string.octdigits
'01234567'

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

>>> import string
>>> string.printable
'0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ!"#$%&\'()*+,-./:;<=>?@[\\]^_`{|}~ \t\n\r\x0b\x0c'

>>> import string
>>> string.whitespace
' \t\n\r\x0b\x0c'