Python反转序列的方法实例分析

>>> l=[1,2,3,4]
>>> ll=l[::-1]
>>> l
[1, 2, 3, 4]
>>> ll
[4, 3, 2, 1]
>>> l=[4,5,6,7]
>>> ll=reversed(l)
>>> l
[4, 5, 6, 7]
>>> ll
<listreverseiterator object at 0x06A07F70>
>>> list(ll)
[7, 6, 5, 4]

>>> t=(2,3,4,5)
>>> tt=t[::-1]
>>> t
(2, 3, 4, 5)
>>> tt
(5, 4, 3, 2)
>>> t=(4,5,6,7)
>>> tt=reversed(t)
>>> t
(4, 5, 6, 7)
>>> tt
<reversed object at 0x06A07E90>
>>> tuple(tt)
(7, 6, 5, 4)

>>> s='python'
>>> ss=s[::-1]
>>> s
'python'
>>> ss
'nohtyp'
>>> s='nohtyp'
>>> ss=''.join(reversed(s))
>>> s
'nohtyp'
>>> ss
'python'