input: 
  def generate_bestselling_books_table(genre: str) -> str:
      """
      Generate an HTML table displaying information about the top 10 bestselling books in a specific genre.
      The table is generated from a SQLite database named 'books.db' with a table 'Books' containing columns:
      id (int), title (string), author (string), genre (string), sales (int).
      
      >>> generate_bestselling_books_table('Fantasy')
      '<table><tr><th>Title</th><th>Author</th><th>Genre</th><th>Sales</th></tr><tr><td>Book1</td><td>Author1</td><td>Fantasy</td><td>1000</td></tr><tr><td>Book2</td><td>Author2</td><td>Fantasy</td><td>900</td></tr></table>'
      """
  
      import sqlite3
  
      # connect to the database
      conn = sqlite3.connect('books.db')
      c = conn.cursor()
  
      # retrieve the data
      c.execute('''SELECT title, author, genre, sales
      FROM Books
      WHERE genre=?
      ORDER BY sales DESC
      LIMIT 10''', (genre,))
  
      # save the results
      results = c.fetchall()
  
      # generate the HTML code
      html = '<table>'
      html += '<tr><th>Title</th><th>Author</th><th>Genre</th><th>Sales</th></tr>'
  
      for result in results:
          title = result[0]
          author = result[1]
          genre = result[2]
          sales = result[3]
  
          html += f'<tr><td>{title}</td><td>{author}</td><td>{genre}</td><td>{sales}</td></tr>'
  
      html += '</table>'
  
      # close the connection
      conn.close()
  
      return html
  
output:     import sqlite3
  
      # connect to the database
      conn = sqlite3.connect('books.db')
      c = conn.cursor()
  
      # retrieve the data
      c.execute('''SELECT title, author, genre, sales
      FROM Books
      WHERE genre=?
      ORDER BY sales DESC
      LIMIT 10''', (genre,))
  
      # save the results
      results = c.fetchall()
  
      # generate the HTML code
      html = '<table>'
      html += '<tr><th>Title</th><th>Author</th><th>Genre</th><th>Sales</th></tr>'
  
      for result in results:
          title = result[0]
          author = result[1]
          genre = result[2]
          sales = result[3]
  
          html += f'<tr><td>{title}</td><td>{author}</td><td>{genre}</td><td>{sales}</td></tr>'
  
      html += '</table>'
  
      # close the connection
      conn.close()
  
      return html