月度归档： 2019 年 10 月

常见的python插入元素方式一般是insert或者手动挪动后修改值,然后其实还有种比较少用的通过零宽切片插入元素的方式,比较有意思,随便记录下.

Python 3.8.0 (v3.8.0:fa919fdf25, Oct 14 2019, 10:23:27) 
[Clang 6.0 (clang-600.0.57)] on darwin
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>>> a = [1,2,3,4,5]
>>> a[:0] = [0,0,0]
>>> a
[0, 0, 0, 1, 2, 3, 4, 5]
>>> a[4:4] = [8,8,8,8,8,8]
>>> a
[0, 0, 0, 1, 8, 8, 8, 8, 8, 8, 2, 3, 4, 5]
>>> a[4:8] = []
>>> a
[0, 0, 0, 1, 8, 8, 2, 3, 4, 5]

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