[Python] How can I produce a human readable difference when subtracting two UNIX timestamps...

This question is similar to this question about subtracting dates with Python, but not identical. I'm not dealing with strings, I have to figure out the difference between two epoch time stamps and produce the difference in a human readable format.

For instance:

32 Seconds
17 Minutes
22.3 Hours
1.25 Days
3.5 Weeks
2 Months
4.25 Years


Alternately, I'd like to express the difference like this:

4 years, 6 months, 3 weeks, 4 days, 6 hours 21 minutes and 15 seconds


I don't think I can use strptime, since I'm working with the difference of two epoch dates. I could write something to do this, but I'm quite sure that there's something already written that I could use.

What module would be appropriate? Am I just missing something in time? My journey into Python is just really beginning, if this is indeed a duplicate it's because I failed to figure out what to search for.

Addendum


For accuracy, I really care most about the current year's calendar.

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