Question

This is a slight update to my previous question

I have a Python list called results. Most result objects in the results list have a person object, and most person objects have a birthdate property (result.person.birthdate). The birthdate is a datetime object.

I would like to order the list of results by birthdate with the oldest first. However, if there isn’t a person object or the person object doesn’t have a birthdate I would still like the result included in the list of results. At the end of the list would be ideal.

What is the most Pythonic way to do this?

Answer 1

import datetime
results.sort(key=lambda r: r.person.birthdate
    if (r and r.person and r.person.birthdate)
    else datetime.datetime.now())

(P.S. You could have just edited your previous question.)