[Tutor] zoneinfo not working properly

[Shashank Jain]

I was using python 3.9.3 then zoneinfo library was working fine without any
issues. but now after installing 3.9.6 there are problems.  Ex.

Using below code there no outputs. and further there are issues while
working with timezones with zoninfo  where I tried same things with pytz
that was giving correct output.

for i in zoneinfo.available_timezones():
    print(i)