input: Write a function to generate an HTML form with a submit button that sends information to a Python program when clicked. The function should return the HTML code for the form.
  
  def generate_html_form():
      return '<form action="action.py" method="post">\n    <input type="submit" value="Submit">\n</form>'
  
  assert generate_html_form()=='<form action="action.py" method="post">\n    <input type="submit" value="Submit">\n</form>'
output: def generate_html_form():
      return '<form action="action.py" method="post">\n    <input type="submit" value="Submit">\n</form>'