input: 
  def select_movies_by_category(database_file: str, category: str) -> None:
      """
      Execute an SQL query to select all movies from a specified category in a given SQLite database.
      Prints each row of the result.
      
      >>> select_movies_by_category('movies.db', 'horror')
      (1, 'The Conjuring', 'horror')
      (2, 'A Quiet Place', 'horror')
      """
      import sqlite3
  
      conn = sqlite3.connect(database_file) 
      cursor = conn.cursor()
  
      query = f"SELECT * FROM Movies WHERE category = '{category}'"
      cursor.execute(query)
  
      result = cursor.fetchall()
      for row in result:
          print(row)
  
      conn.close()
  
output:     import sqlite3
  
      conn = sqlite3.connect(database_file) 
      cursor = conn.cursor()
  
      query = f"SELECT * FROM Movies WHERE category = '{category}'"
      cursor.execute(query)
  
      result = cursor.fetchall()
      for row in result:
          print(row)
  
      conn.close()