Truthiness & None

Python lets you ask if value: directly. The rule:

What's "falsy"

• False, None
• 0, 0.0
• "", [], {}, set() — empty containers

Everything else is "truthy".

is vs ==

• == checks equality of values
• is checks identity (same object in memory)
• Always use is for None: if x is None:

Try it

1. Write a function that returns the first truthy item from a list, or None.
2. What does bool("False") return? Why?