python中字符串的切片是什么意思 为什么python的切片到底是什么意思
python\u4e2d\u7684\u5b57\u7b26\u4e32\u5207\u7247\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff0c\u4e0b\u9762\u8bed\u53e5str1[2:4]\u662f\u4ec0\u4e48\u610f\u601d\u4f60\u597d\uff01
\u4ee3\u8868\u7684\u662f\u4ece\u7b2c3\u4e2a\u5b57\u7b26\u5f00\u59cb\uff0c\u7684\u4e24\u4e2a\u5b57\u7b26
\u5373\u7b2c\u4e09\u4e2a\u5b57\u7b26\u5230\u7b2c\u56db\u4e2a\u5b57\u7b26
str1[0]
\u5373\u7b2c\u4e00\u4e2a\u5b57\u7b26
\u5982\u6709\u7591\u95ee\uff0c\u8bf7\u8ffd\u95ee\u3002
\u8fd9\u6837\u89e3\u91ca\u5427some_iterabel[a:b:c]
a\u662f\u8d77\u59cb,b\u662f\u7ed3\u675f,c\u65f6\u4e00\u6b65\u8d70\u591a\u5c11
a[-1:-4:-1]\u662f-1\u5f00\u59cb-4\u7ed3\u675f\uff0c\u4e00\u6b65\u8d70-1
\u5148\u5b9a\u8303\u56f4,-1\u5230-4\u5c31\u662f654\uff0c\u4e00\u6b65\u8d70-1\uff0c\u5c31\u662f\u5012\u7740\u8d70\uff0c\u6240\u4ee5\u5c31\u662f654\u4e0d\u53d8\u3002
\u6709\u8da3\u7684\u662fa[-1:-4:1]
\u8303\u56f4\u8fd8\u662f654\u4e0d\u8fc7\u81ea\u76f8\u77db\u76fe\u4e86\uff0c\u56e0\u4e3a\u662f\u4ece\u540e\u5f80\u524d\u7b97\u7684\uff0c\u4f60\u53c8\u8ba9\u4ed6\u6b63\u7740\u8d70\uff0c\u81ea\u7136\u6ca1\u6709\u4e1c\u897f\u554a
以数组为例
1
2
3
4
5
6
7
8
9
>>> exp = [1,2,3,4,5]
>>> print exp[2:4]
[3, 4]
>>> print exp[:4]
[1, 2, 3, 4]
>>> print exp[1:]
[2, 3, 4, 5]
>>> print exp[:]
[1, 2, 3, 4, 5]
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