input: 
  def fetch_horror_movies_from_db() -> None:
      """ Execute an SQL query to fetch all movies from a database that belong to the 'horror' category and print them.
      >>> fetch_horror_movies_from_db() # assuming the database 'movies.db' has appropriate data
      ('Horror Movie 1', 'horror')
      ('Horror Movie 2', 'horror')
      """
      import sqlite3
      
      conn = sqlite3.connect('movies.db') 
      cursor = conn.cursor()
      
      cursor.execute("SELECT * FROM Movies WHERE category = 'horror'")
      
      result = cursor.fetchall()
      for row in result:
          print(row)
      
      conn.close()
  
output:     import sqlite3
      
      conn = sqlite3.connect('movies.db') 
      cursor = conn.cursor()
      
      cursor.execute("SELECT * FROM Movies WHERE category = 'horror'")
      
      result = cursor.fetchall()
      for row in result:
          print(row)
      
      conn.close()