在Python中按索引填充列表/数组? [英] Populating a list/array by index in Python?

问题描述

这可能吗?

myList = []

myList[12] = 'a'
myList[22] = 'b'
myList[32] = 'c'
myList[42] = 'd'

当我尝试时，我得到:

# IndexError: list assignment index out of range # 

推荐答案

在对它进行索引之前，您必须预先将其填充一些东西(例如0或None):

You'll have to pre-fill it with something (e.g. 0 or None) before you can index it:

myList = [None] * 100  # Create list of 100 'None's
myList[12] = 'a'  # etc.

或者，使用字典而不是列表，例如

Alternatively, use a dict instead of a list, as Alex Martelli suggested.

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