old_contents: 
  # this is the first comment
  spam = 1 # and this is the second comment
           # ... and now a third!
  text = "# This is not a comment because it's inside quotes."
  
  print(spam)
  print(text)
  
  tax = 12.5 / 100
  price = 100.50
  print(price * tax)
  
  # ͷƼ 忡 (_)   µ  ϴ ̴.
  # print(price + _)
  #  113.0625  ´.
  
  print(round(price, 2))
  
  #Built-in Functions
  # https://docs.python.org/3/library/functions.html
  
  
  
  # NUMBERS
  print("\n - NUMBERS - ")
  print(2+2)      # int
  print(50-5+6)   # int
  # /  ׻ float 
  print((50-5*6)/4)   # float
  print(8/5)          # float
  
  
new_contents: 
  # this is the first comment
  spam = 1 # and this is the second comment
           # ... and now a third!
  text = "# This is not a comment because it's inside quotes."
  
  print(spam)
  print(text)
  
  tax = 12.5 / 100
  price = 100.50
  print(price * tax)
  
  # 인터렉티브 모드에서 밑줄(_)은 가장 마지막에 출력된 값을 보관하는 변수이다.
  # print(price + _)
  # 결과는 113.0625 가 나온다.
  
  print(round(price, 2))
  
  #Built-in Functions
  # https://docs.python.org/3/library/functions.html
  
  
  
  # NUMBERS
  print("\n - NUMBERS - ")
  print(2+2)      # int
  print(50-5+6)   # int
  # / 나누기는 항상 float 리턴
  print((50-5*6)/4)   # float
  print(8/5)          # float
  
  
subject: change file format euc-kr -> utf-8 without bom