input: Write a python function to create a basic HTML form with a submit button.
  assert create_form() == '<form action="action.py" method="post">\n    <input type="submit" value="Submit">\n</form>'
  assert create_form(action="submit.py") == '<form action="submit.py" method="post">\n    <input type="submit" value="Submit">\n</form>'
  assert create_form(method="get") == '<form action="action.py" method="get">\n    <input type="submit" value="Submit">\n</form>'
output: def create_form(action="action.py", method="post"):
      return f'<form action="{action}" method="{method}">\n    <input type="submit" value="Submit">\n</form>'