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  • python slice 切片

    list,tuple,string,bytes对象可以进行切片处理,生成一个新的这些类的对象。

    格式:li[start: stop: step]

    list切片:

     1 >>> li = ['Michael', 'Sarah', 'Tracy', 'Jack', 'Black']
     2 >>>li[0]
     3 'Michael'
     4 >>>li[-1]
     5 'Black'
     6 >>>li[1:3]
     7 ['Sarah', 'Tracy']
     8 >>>li[:3]
     9 ['Michael', 'Sarah', 'Tracy']
    10 >>>li[-2:]
    11 ['Jack', 'Black']
    12 >>>li[:]
    13 ['Michael', 'Sarah', 'Tracy', 'Jack', 'Black']
    14 >>>li[::2]
    15 ['Michael', 'Tracy', 'Black']

    tuple切片:

     1 >>> li = ('Michael', 'Sarah', 'Tracy', 'Jack', 'Black')
     2 >>> li[0]
     3 'Michael'
     4 >>> li[-1]
     5 'Black'
     6 >>> li[1:3]
     7 ('Sarah', 'Tracy')
     8 >>> li[-2:]
     9 ('Jack', 'Black')
    10 >>> li[:]
    11 ('Michael', 'Sarah', 'Tracy', 'Jack', 'Black')
    12 >>> li[::2]
    13 ('Michael', 'Tracy', 'Black')

    string切片:

     1 >>> s = 'abcdefgh'
     2 >>> s[0]
     3 'a'
     4 >>> s[-1]
     5 'h'
     6 >>> s[1:3]
     7 'bc'
     8 >>> s[-2:]
     9 'gh'
    10 >>> s[:]
    11 'abcdefgh'
    12 >>> s[::2]
    13 'aceg'

    bytes切片(注:python3有bytes类型,python2没有):

     1 >>> a = b'abcdef'
     2 >>> a[0]
     3 97
     4 >>> a[-1]
     5 102
     6 >>> a[1:3]
     7 b'bc'
     8 >>> a[-2:]
     9 b'ef'
    10 >>> a[:]
    11 b'abcdef'
    12 >>> a[::2]
    13 b'ace'
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  • 原文地址:https://www.cnblogs.com/gundan/p/8047077.html
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