input: Write a function to create an HTML form with a submit button to send information to a Python program. The form should include an input tag for a text field and the submit button should be labeled "Submit".
  assert create_html_form()=='<form action="action.py" method="post"><input type="text" name="text_input"><input type="submit" value="Submit"></form>'
  assert create_html_form()=='<form action="action.py" method="post"><input type="text" name="text_input"><input type="submit" value="Submit"></form>'
  assert create_html_form()=='<form action="action.py" method="post"><input type="text" name="text_input"><input type="submit" value="Submit"></form>'
  assert create_html_form()=='<form action="action.py" method="post"><input type="text" name="text_input"><input type="submit" value="Submit"></form>'
  assert create_html_form()=='<form action="action.py" method="post"><input type="text" name="text_input"><input type="submit" value="Submit"></form>'
output: def create_html_form():
      return '<form action="action.py" method="post"><input type="text" name="text_input"><input type="submit" value="Submit"></form>'