While working on a dashboard project that used Django, I found myself reaching for functions in PostgreSQL to generate time series data and calculate percentiles. In Django 1.8, Func() expressions were added to let users access database-specific functions more easily. Django subclasses Func to give you common database functions, so I did the same to expose some PostgreSQL date/time functions and a percentile function from the PostgreSQL aggregate functions.

Since we're likely to need these same functions in future projects and I didn't have much practice building Python packages, I wrapped the functions up and open-sourced them. You can read the docs and check out the source code.

One thing I enjoyed about packaging up the code is using pbr to build the package on the recommendation of The Hacker's Guide to Python. I found it hard to find what I needed in the documentation, but it was nice to use besides that. Using git tags and requirements.txt -- two things I was already using -- to version the package and set the requirements was great.