True — Advanced Playground

Boolean literal representing true/1

Python Playground

class QueryResult:
    def __init__(self, rows):
        self.rows = rows

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

    def __len__(self):
        return len(self.rows)

empty = QueryResult([])
full = QueryResult([{"id": 1}, {"id": 2}])

print(f"Empty result: {bool(empty)}")
print(f"Full result: {bool(full)}")
if full:
    print(f"Got {len(full)} rows")

Output

Click "Run" to execute your code

Python calls __bool__ first; if not defined, falls back to __len__. If neither exists, the object is always truthy.

Challenge

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

View all Advanced examples for True