3 ms·

Yes, you should definitely should be more explicit if that's what you intend to check: PEP8 makes that explicit. I'm not sure why you'd defend against None any

• statictype 16y ago
  There's nothing wrong with `is l`. Sounds like you're just splitting hairs. He's defending against None because calling __len__ on None results in an exception. 3.14159 also results in an exception but it's far more likely that the object passed was None than that it was a completely different type than the one expected.
  • jemfinch 16y ago
    > it's far more likely that the object passed was None than that it was a completely different type than the one expected. FYI, None is a completely different type than the one expected.