input: Write a function to create an HTML form with a submit button to send information to a Python program. The form should use the post method and point to a Python program named "action.py".
  assert create_html_form()=='<form action="action.py" method="post">\n    <input type="submit" value="Submit">\n</form>'
  assert create_html_form()=='''<form action="action.py" method="post">
      <input type="submit" value="Submit">
  </form>'''
output: def create_html_form():
      return '<form action="action.py" method="post">\n    <input type="submit" value="Submit">\n</form>'