Question

I’m very new to python.

I would like to have an array of exactly 10000 big integers (arbitrary precision).

I tried to do it like this:

M = []

M[0] = 1
M[1] = 1

for k in range(2,10001):
        M[k] = ...

but I get:

IndexError: list assignment index out of range

What data structure should I use and how do I initialize it and reserve space for it?

Answer 1

The list isn’t initialized correctly.

Try M = [0]*10000. This will give you a list of the correct size. Just replace the 0 with whatever default you want (or overwrite it with the right value afterwards).