1. Browsers make requests to a given url (http://enginehere.com/sample/)
2. The URL is broken down into parts (protocol, hostname, and path)
3. Hostname is converted into an IP address for a computer connected to the internet (server).  The browser and server connect.
4. The server runs a program to return the resource based on the path (/sample/ in this case).   The program can be Python, Ruby, etc.

from some_fake_module import hit_dbfrom another_fake_module import render
def handle_hello(request):     greeting = request.POST.get("greet")     person = request.POST.get("person")     we_know_them = False     if person and greeting:         # hit database and confirm that we know this person         we_know_them = hit_db(person)         if we_know_them:             template = "my_template_name.html"             html = render(template, {"person": person, "greeting": greeting})             return html     else:              return "We do not know you"

  # from the command line pip install the web server library  sudo pip install lpthw.web

import web

urls = (
  '/', 'index'
)

app = web.application(urls, globals())

class index:
    def GET(self):
        greeting = "Hello World"
        return greeting

## If you run this module directly (python this_module.py), then run code block
if __name__ == "__main__":
    app.run()