سروش یزدانی

while True:     radius = input("Enter the radius of sphere (print 'q' to quit): ")     if radius == "q":         break     else:         radius = int(radius)     V = 4/3 * (3.14 * radius**3)     S = 4 * 3.14 * (radius**2)     print (f"Volume = {V}")     print (f"Surface = {S}")