input: def generate_html_table(table_name: str, columns: List[str], genre: str) -> str:
      """Generate an HTML table displaying information about the top 10 bestselling books in the specified genre.
      >>> generate_html_table('Books', ['id', 'title', 'author', 'genre', 'sales'], 'Fantasy')
      '<table><tr><th>Title</th><th>Author</th><th>Genre</th><th>Sales</th></tr><tr><td>...</td><td>...</td><td>Fantasy</td><td>...</td></tr></table>'
      """
output:     html = f'<table><tr><th>Title</th><th>Author</th><th>Genre</th><th>Sales</th></tr>'
      for _ in range(10):
          html += f'<tr><td>...</td><td>...</td><td>{genre}</td><td>...</td></tr>'
      html += '</table>'
      return html