server.py

# gunicorn
# fastapi or flask or aiohttp or sarlette
# Django

# Model -> View -> Template -> Response


defrender_template(template_name='index.html', context={}):
html_str=""
withopen(template_name, 'r') asf:
html_str=f.read()
html_str=html_str.format(**context)
returnhtml_str

defhome(environ):
returnrender_template(
template_name='index.html', 
context={}
 )

defcontact_us(environ):
returnrender_template(
template_name='contact.html', 
context={}
 )

defapp(environ, start_response):
path=environ.get("PATH_INFO")
ifpath.endswith("/"):
path=path[:-1]
ifpath=="": # index / root of the web app
data=home(environ)
elifpath=="/contact":
data=contact_us(environ)
else:
data=render_template(template_name='404.html', context={"path": path})
data=data.encode("utf-8")
start_response(
f"200 OK", [
 ("Content-Type", "text/html"),
 ("Content-Length", str(len(data)))
 ]
 )
returniter([data])