Ejercicio003

exercise003.py

#-*- coding: utf-8 -*-
a = [1,2,3,4,3,2,1,2,3,4,5,6,7,9,8,7,6,7,8]

def contador(a, x):
    b = []
    for i in a:
        if i <= x:
            b.append(i)
    return b

if __name__ == '__main__':
    x = int(input("Ingrese número a comparar: "))
    print(contador(a,x))

It's not so much dificult to follow this code, the contador function takes the a list and a number typed by user, compares each item of the list a with the user's number and all values fewer than user's number are moved to b list.