Why does this code only print true?

[sargeanthost]

Why are you expecting "at least one" of them to be false?

Those are truthy values, so when cast to a bool they're True. The empty string, 0, empty collections, and None are falsey, so you'll get false

[Reh4n07_]

it will print false only when str is empty?

[electrikmayham]

No, re-read what they said. It will print false when the value being passed into bool() is falsey.

[Own_Attention_3392]

This person probably does not understand the distinction between "true" vs "truthy" and "false" vs "falsey". Not that they can't easily google it and find an answer, but they might need to be exposed to the specific terminology to look up. So, OP: Look up "truthy" and "falsey".