Repeating Timer in Python

While working on Scheduler [1], I've encountered an inconvenience caused by lack of auto-repeat timer in standard Python API.
In this post I will present RepeatTimer class that features:

• RepeatTimer (as its threading.Timer ancestor) is being executed in a separate thread
• RepeatTimer executes function on its triggering
• Interface provides ability to trigger RepeatTimer immediately, and start new countdown
• Interface provides ability to set new interval that will be applied after upcoming triggering
• cancel method disengage RepeatTimer and kills its thread

Gist below presents the code:

[1] Scheduler at Github
https://github.com/mushkevych/scheduler