'''for loop'''

import time

for num in range (0,10):
    print(num*2)
    time.sleep(0.75)
    
for num in range (18,23):
    print(num)
    time.sleep(0.5)


start_num = 4
stop_num = 20
step = 2

for num in range (start_num,stop_num, step):
    print(num)
    
    
start_num = 10
stop_num = 0
step = -1
for       
    
