Python array as a counter

I’m a Python 3.0 beginner and I’m struggling to find a solution to the following problem. It’s a step for a Galton Board simulation exercise.

1. I have an numpy array, which length is auto generated based on another variable
2. I am then generating a set of numbers, adding them to a list and summing them
3. I would finally want to add a counter of +1 to the array index, which equals the number in the sum in step 2.

import numpy as np
import random as rnd

zufall = rnd.randint(0,1)
zufall_list = []
hoehe = int(input("Höhe? "))
behaelter = np.zeros(hoehe+1, int)


for i in range(hoehe):
    zufall_list.append(rnd.randint(0,1))

    for j in str(sum(zufall_list)):
        behaelter[j] += 1
print(zufall_list)

I get an IndexError: only integers, slices (:), ellipsis (…), numpy.newaxis (None) and integer or boolean arrays are valid indices error and don`t understand why that is.

Answer

for j in str(sum(zufall_list)):
    behaelter[j] += 1

In this line, you are using str(sum(…)), a string as index. Although string is iterable, it cannot be used as an index.

In your case, I would do behaelter[int(j)] to change ‘j’ into an integer so that you can use it as an index.