[CentOS] Periodic speed test

I run the speedtest from <https://pypi.python.org/pypi/speedtest-cli/>
quite often, and find it very reliable.

I'm wondering if anyone has developed a version
to run the speed test at regular intervals, say every 6 hours,
and record the results in a simple database or just a file?

I imagine it would be a fairly easy task to modify the Python code
to do this, but it would be even easier if someone has already done it!

-- 
Timothy Murphy  
gayleard /at/ eircom.net
School of Mathematics, Trinity College, Dublin