bool — Easy Playground

Called by bool(); defines truthiness of the object

Python Playground

class NonEmpty:
    def __init__(self, items):
        self.items = items

    def __bool__(self):
        return len(self.items) > 0

a = NonEmpty([1, 2, 3])
b = NonEmpty([])
print(bool(a))
print(bool(b))
if a:
    print("a is truthy")

Output

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__bool__ called by bool(); defines truthiness of the object. Implementing it lets you customize how Python interacts with your objects.

Challenge

Try modifying the code above to explore different behaviors. Can you extend the example to handle a new use case?

View all Easy examples for __bool__

__bool__ — Easy Playground

Challenge

bool — Easy Playground