input the following command:

wgz@wgz:/tmp/test$ python3 -m http.server --bind localhost --cgi

file cgi.html

<form action='cgi-bin/cgi_test.py' method='post'>

<p>Username</p>

<p><input type='text'></p>

<p><input type='submit' ?value='Login'></p>

file cgi_test.py

#! /usr/bin/env python3

print('Content-type: text/html\n')

print('hello world')