user authentication interface in python

[scn]

hello.  does anyone have a high-level example of how to implement
'secure' user authentication interface for web users in python.

i am in the process of designing a simple web application that
requires user authentication and i remembered that php typically held
system authentication information in a separate file and included this
file in the main interface script.

is there a similar convention or methodology in python for
accomplishing the same idea?

if someone would please point me in the right direction, i can take it
from there.

thank you.