함수

def print_ntimes():
  print("대신증권")

반환값이 있는 함수

def cal_upper(price):
  increment = price * 0.3
  upper_price = price + increment
  return upper_price

두개의 값 반환

def cal_upper_lower(price):
  offset = price * 0.3
  upper = price + offset
  lower = price - offset
  return (upper, lower)
  
(upper, lower) = cal_upper_lower(10000)