story.py

def fun(length,a):
    b = a
    for i in range(length):
        a+=1
    print("value of a before: "+str(b)+" now it's "+str(a))
    return a
    
def main():
    r1 = fun(50000000,0)
    r2 = fun(100,12)
    r3 = fun(100,41)

   
if __name__=="__main__":
    main()