Reputation: 343
class A(object):
__A = None
def get_a(self):
return self.__A
def set_a(self, value):
self.__A = value
class B(A):
def method_b(self, value):
self.set_a(value)
class C(A):
def method_c(self)
self.get_a()
Someone can to explain me how can i to catch installed value in method_b inside my 'C' class method?
P.S. In this variant i just getting nothing.
Upvotes: 2
Views: 11410
Reputation: 55509
Python isn't Java; you don't need setters & getters here: just access the attributes directly.
There are three problems with your code.
C.method_c()
has no return
statement, so it returns None
.
You are using __
name mangling when that's exactly what you don't want.
In A.set_a()
you want to set a class attribute, but your assignment instead creates an instance attribute which shadows the class attribute.
Here's a repaired version.
class A(object):
_A = 'nothing'
def get_a(self):
return self._A
def set_a(self, value):
A._A = value
class B(A):
def method_b(self, value):
self.set_a(value)
class C(A):
def method_c(self):
return self.get_a()
b = B()
c = C()
print(c.method_c())
b.method_b(13)
print(c.method_c())
output
nothing
13
Here's a slightly more Pythonic version:
class A(object):
_A = 'nothing'
class B(A):
def method_b(self, value):
A._A = value
class C(A):
pass
b = B()
c = C()
print(c._A)
b.method_b(13)
print(c._A)
Upvotes: 6