How to remove a variable from a function that is in a loop?

Question

Python

import math


def calculation(a_a):
    for i in range(10000):  # до 9999
        b = str(a_a)
        num = []

        q = int(b[0])
        w = int(b[1])
        e = int(b[2])
        r = int(b[3])

        if math.fabs(q - r) == w + e:
            num.extend(f'{q}{w}{e}{r}')


the_a = 1400
calculation(the_a)

the_a = 1600
calculation(the_a)
print(num)

I need to output the num variable. But due to my knowledge of Python, I don't know how

Answer 1

return(variable name)

def adding(a, b): 
 	# this function is return the value of(a + b) 
  return a + b
print(adding(2,3)) # выведет 5