Babun is “A Windows shell you will love!”
It's a turn-key CygWin distribution for developers and is very easy to install and maintain. For a Python developer, Babun allows working in an almost-POSIX environment – with some limitation, of course. This causes less friction when handling FOSS projects that are often biased towards a standard Linux environment, e.g. by using shell scripts for boot-strapping and things like that.