To be more Pythonic

[csukuangfj]

There exist shell scripts and Perl scripts for data preparation, most of which are modified from Kaldi. They provide extra
functionalities that are actually not needed in snowfall.

I would suggest doing as many things as possible in Python and getting rid of shell scripts and Perl scripts as best as we can.

[danpovey]

Sure, but bear in mind that the whole idea of Snowfall (vs. Icefall) is "move fast and break things". At this point our main goal is to get a prototype working and debug k2 and lhotse, so while eventually we'll want to do things more Pythonically, let's not prioritize it too highly.

[pzelasko]

+1 to what both of you are saying. These scripts are also on my radar, but I'm refraining myself from touching that as I'd prefer to contribute to a working recipe first :)