Answer 1

it depends on what you want to do.
but as far as I know we have 2 way for showing pictures in python:

1.using matplot library:
matplot is not build for showing pictures but there are a lots of code to show you how to open pictures on them

2.using system commands:
using subprocess or os library to enter a cmd or terminal command to open that image for you

if you need to show image in gui thats a hole another story