Explain me this snippet pls

Question

Hello everyonen could someone please explain me how this snippet work?
when i open cmd and launch my script with python i can see something happened but can't explain why..

here is the part i don't understand:
if __name__=='__main__':
import sys
pluto=Dog()
if len(sys.argv)>1:
pluto.sound=sys.argv[1]
print(pluto.make_sound())

to look at the full code please check this link :
https://code.sololearn.com/c0UbA9o1NLq6

thanks you in advence for your help ;)

Answer 1

So if you run your file from cmd and pass addition arguments
like:
python3 Animal.py meow

sys.argv makes a list of ['Animal.py','meow'] and then if condition checks it's length which in this case is greater than 1 ,so second argument(meow) is assigned to Object pluto sound property and printed thereafter ,but if no additional argument is passed barks get printed

Answer 2

thanks for this nice explanation ! ;)