Well, nice perspective. It's a valid consideration, sound theory but poor practicality according to me.
It you view it like this then between the moment we press run or enter key on the terminal, our Python interpreter might get deleted. We never know, it can happen. Though it's nice to go in and catch exceptions, if you have a long operation upcoming it might be nice to see if your key element is present. Much like checking if goal posts are present before starting a football game. You can of course start the match, pass the ball around and when shooting you stop the match as you realise that the goal posts are not around. Checking by exceptions is what the snippet i shared does. But we check for the ability to do it before we start. Of course, it can change in the seconds that follow. But it's too much pure logic at work. -- https://mail.python.org/mailman/listinfo/python-list
