Python Gotchas: 5 Worst Mistakes You Should Avoid

Since 0 is considered a "Falsy" value, then the comparison returns 'True`.

No, that's the kind of thing JavaScript does. Most Falsy values (None, empty string/list/dict/etc) are not equal to False.

False == 0 and True == 1 because bool is a subclass of int. You can treat booleans just like those numbers, for example True + True == 2. This can be very useful.

Very well written Miguel Brito. Thanks for sharing.

enlightening article, Love it, Thanks for sharing

Great article.

I think the example for the walrus operator could be better. Something like

# We want to increment by the number if it's nonzero, otherwise we want to increment by at least 1
x = get_some_number_maybe_0()
if x:
  y += x
else:
  y += 1

Which can be transformed with walrus operator to:

if x := get_some_number_maybe_0():
    y += x
else:
    y += 1

If the example you've shown, should_run isn't necessary, you can just base the if statement on the return of the os.environ call.

I guess the above could also be done as y += max(1, get_some_number_maybe_0()). Dammit, I need to stop finding ways to optimize my examples :P

Edit: The PEP introducing the operator has some better, albeit more complicated examples python.org/dev/peps/pep-0572

I was Waaaaat in the whole post. hahahahah Thanks to Python Tutor I can understand the logic. Loved the GIFs, btw!