How do you add the results together each time a function is called?

[Exsul]

First...

I don't understand how you're using num in

for num in range(1000):
    counts[random.randint(1, 10)] += 1

Num doesn't appear in the indented line.

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Did you consider using numpy to solve this problem? if you use numpy, you can easily generate array of random numbers and then count each number, something like this:

from collections import Counter
import numpy as np
Counter(np.random.randint(0, 10, 1000))

Thanks, my data-scientist friend told me about that. I just wanted to see if I could do it without importing any more modules.