Build in functions & top level syntax
and their corosponding data model methods.
Build in functions and their data model methods
Build in function |
Data model method |
|---|---|
len() |
__len__(self) |
str() |
__str__(self) |
repr() |
__repr__(self) |
abs() |
__abs__(self) |
bool() |
__bool__(self) |
int() |
__int__(self) |
float() |
__float__(self) |
round() |
__round__(self) |
iter() |
__iter__(self) |
next() |
__next__(self) |
getitem() |
__getitem__(self, index) |
setitem() |
__setitem__(self, index, value) |
delitem() |
__delitem__(self, index) |
contains() |
__contains__(self, item) |
enter() |
__enter__(self) |
exit() |
__exit__(self, exc_type, exc_val, exc_tb) |
Example:
So when you use the len() build in function, you are calling the __len__() method of the object.
1class Person:
2 def __init__(self, name, height):
3 self.name = name
4 self.height = height
5
6 def __len__(self):
7 return self.height
8
9x = Person('Claus', 180)
10len(x) # this is calling/executing the __len__() method.
Top level syntax and their corosonding datamodel methods
Top-level syntaks |
Dundermetode |
|---|---|
x + y |
__add__(self, other) |
x - y |
__sub__(self, other) |
x * y |
__mul__(self, other) |
x / y |
__truediv__(self, other) |
x // y |
__floordiv__(self, other) |
x % y |
__mod__(self, other) |
x ** y |
__pow__(self, other) |
x == y |
__eq__(self, other) |
x != y |
__ne__(self, other) |
x > y |
__gt__(self, other) |
x < y |
__lt__(self, other) |
x >= y |
__ge__(self, other) |
x <= y |
__le__(self, other) |
x(x1, x2) |
__call__(self, *args, **kwargs) |
x[index] |
__getitem__(self, index) |
x[index] = value |
__setitem__(self, index, value) |
del x[index] |
__delitem__(self, index) |
x in y |
__contains__(self, item) |
with x as y: |
__enter__(self) and __exit__(self, exc_type, exc_val, exc_tb) |
Example:
So when you use the + sign, you are calling the __add__() method of the object.
1class Person:
2 def __init__(self, height):
3 self.height = height
4 def __add__(self, other):
5 return Person(self.height/2 + other.height/2)
6
7x = Person(180)
8y = Person(162)
9x + y # the + sign is calling/executing the __add__() method.