Populating a list/array by index in Python?

Question

Is this possible:

myList = []

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

When I try, I get:

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Answer 1

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.

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