In Python, “dunder” methods, short for “double underscore” methods, are special methods that allow developers to define the behavior of built-in operations for custom objects. For instance, when you use the
+ operator to add two objects, Python internally calls the
__add__ method. Similarly, other operators have their corresponding dunder methods.
However, the term “
not and” operator might be a bit misleading, as there isn’t a direct “
not and” operator in Python.
Instead, Python provides individual operators for
and. But if we delve into the realm of bitwise operations, we find operators that might resemble this behavior: the bitwise NOT (
~) and the bitwise AND (
Let’s explore the dunder methods associated with these operators.
Bitwise NOT (~) and its Dunder Method __invert__
The bitwise NOT operator flips the bits of a number. For a custom class, if you want to define or override the behavior of the
~ operator, you’d use the
class BitwiseNumber: def __init__(self, value): self.value = value def __invert__(self): return BitwiseNumber(~self.value) def __repr__(self): return str(self.value) number = BitwiseNumber(5) print(~number) # Outputs: -6
In the above example, the
__invert__ method returns a new
BitwiseNumber object with its value inverted.
Bitwise AND (&) and its Dunder Method __and__
The bitwise AND operator performs a bitwise AND operation between two numbers. For custom classes, the behavior of the
& operator can be defined or overridden using the
class BitwiseNumber: def __init__(self, value): self.value = value def __and__(self, other): if isinstance(other, BitwiseNumber): return BitwiseNumber(self.value & other.value) return NotImplemented def __repr__(self): return str(self.value) number1 = BitwiseNumber(5) # Binary: 101 number2 = BitwiseNumber(3) # Binary: 011 print(number1 & number2) # Outputs: 1 (Binary: 001)
In this example, the
__and__ method checks if the other object is an instance of
BitwiseNumber and then performs a bitwise AND operation.
While there isn’t a direct “not and” operator in Python, leveraging the
__and__ methods, you can define how the bitwise NOT and AND operations work for custom objects, respectively.
Emily Rosemary Collins is a tech enthusiast with a strong background in computer science, always staying up-to-date with the latest trends and innovations. Apart from her love for technology, Emily enjoys exploring the great outdoors, participating in local community events, and dedicating her free time to painting and photography. Her interests and passion for personal growth make her an engaging conversationalist and a reliable source of knowledge in the ever-evolving world of technology.