PEP8, however also says

---

For sequences, (strings, lists, tuples), use the fact that empty sequences are false:

Yes:

if not seq:

if seq:

No:

if len(seq):

if not len(seq):

---

Which is truthy, yet seems to me like an idiomatic way, often encountered "in the wild".

See https://pep8.org/

For the explanation see corresponding thread at https://stackoverflow.com/questions/53513/how-do-i-check-if-a-list-is-empty#:~:text=it's%20a%20trade-off%20between%20explicitness%20and%20type%20flexibility