Библиотека Python разработчика. Книги по программированию на Python.
obj.x is a call of the x method. In Java, it's recommended to make all attributes private and write trivial getters instead: public int getX() { return this.x }.
Python offers a solution that is somehow similar to that that Ruby has. You can define property so obj.x invokes a method instead of returning the x attribute directly.
class Example:
def __init__(self, x):
self._x = x
@property
def x(self):
return self._xarray = [1, 2, 3, 4, 5, 6, 7, 8, 9]
print(array[::2])
# Вывод : [1, 3, 5, 7, 9]
Подписывайтесь на канал 👉@pythonofffclass GrandParent:
pass
class Parent1(GrandParent):
pass
class Parent2(GrandParent):
pass
class Child(Parent1, Parent2):
pass
Which order will be used to look up the Child.x() method? The naive approach is to recursively search through all parent classes which gives us Child, Parent1, GrandParent, Parent2. While many programming languages follow this method indeed, it doesn't quite make sense, because Parent2 is more specific than GrandParent and should be looked up first.
In order to fix that problem, Python uses C3 superclass linearization, the algorithm that always searches for a method in all child classes before looking up the parent one:
In : Child.__mro__
Out:
(__main__.Child,
__main__.Parent1,
__main__.Parent2,
__main__.GrandParent,
object)