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https://docs.python.org/3/library/stdtypes.html#truth-value-testing
now u need to understand: if i not in input() then d[i] will return [] right? So an object is considered true unless its class defines either a bool() method that returns False or a len() method that returns zero, when called with the object. 1 Here are most of the built-in objects considered false:
constants defined to be false: None and False.
zero of any numeric type: 0, 0.0, 0j, Decimal(0), Fraction(0, 1)
empty sequences and collections: '', (), [], {}, set(), range(0)
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https://docs.python.org/3/library/stdtypes.html#truth-value-testing now u need to understand: if i not in input() then d[i] will return [] right? So an object is considered true unless its class defines either a bool() method that returns False or a len() method that returns zero, when called with the object. 1 Here are most of the built-in objects considered false:
constants defined to be false: None and False.
zero of any numeric type: 0, 0.0, 0j, Decimal(0), Fraction(0, 1)
empty sequences and collections: '', (), [], {}, set(), range(0)