12.5. Operators Builtin

12.5.1. Rationale

Table 12.4. Builtin Functions Overload

Function

Method

abs(obj)

obj.__abs__()

bool(obj)

obj.__bool__()

complex(obj)

obj.__complex__()

del obj

obj.__del__()

delattr(obj, name)

obj.__delattr__(name)

dir(obj)

obj.__dir__()

divmod(obj, other)

obj.__divmod__(other)

float(obj)

obj.__float__()

getattr(obj, name, default)

obj.__getattr__(name, default)

hash(obj)

obj.__hash__()

hex(obj)

obj.__hex__()

int(obj)

obj.__int__()

iter(obj)

obj.__iter__()

len(obj)

obj.__len__()

next(obj)

obj.__next__()

oct(obj)

obj.__oct__()

pow(obj)

obj.__pow__()

reversed(obj)

obj.__reversed__()

round(obj, ndigits)

obj.__round__(ndigits)

setattr(obj, name)

obj.__setattr__(name)

12.5.2. Example

>>> from math import sqrt
>>> from dataclasses import dataclass
>>>
>>>
>>> @dataclass
... class Vector:
...     x: int = 0
...     y: int = 0
...
...     def __abs__(self):
...         return sqrt(self.x**2 + self.y**2)
>>>
>>>
>>> abs(Vector(x=3, y=4))
5.0

12.5.3. Use Case

>>> class Astronaut:
...     def __float__(self) -> float:
...         return 1961.0
...
...     def __int__(self) -> int:
...         return 1969
...
...     def __len__(self) -> int:
...         return 170
...
...     def __str__(self) -> str:
...         return 'My name... José Jiménez'
...
...     def __repr__(self) -> str:
...         return f'Astronaut()'
>>>
>>>
>>> astro = Astronaut()
>>>
>>> float(astro)
1961.0
>>>
>>> int(astro)
1969
>>>
>>> len(astro)
170
>>>
>>> repr(astro)
'Astronaut()'
>>>
>>> str(astro)
'My name... José Jiménez'
>>>
>>> print(astro)
My name... José Jiménez