Ingwar :
I have some class Foo and Bar, that inherits of Foo. And I need to raise error, when that not overriding all methods in parent class. Also do not let create new methods in Bar. For example:
class Foo:
def __new__(self):
**Some forbidding magic**
def a(self):
pass
def b(self):
pass
class Bar(Foo):
def a(self):
pass
class Baz(Foo):
def a(self):
pass
def b(self):
pass
def c(self):
pass
>>> a = Bar()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
SyntaxError: not all methods was overrided in Bar
>>> b = Baz()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
SyntaxError: new methods found in Baz
How would be able to perform this?
avayert :
You can use the abc module to achieve the first part:
>>> import abc
>>>
>>> class Base(abc.ABC):
... @abc.abstractmethod
... def a(self): ...
... @abc.abstractmethod
... def b(self): ...
...
>>> class ImproperChild(Base):
... def a(self): ...
...
>>> class ProperChild(Base):
... def a(self): ...
... def b(self): ...
...
>>> ImproperChild()
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
TypeError: Can't instantiate abstract class ImproperChild with abstract methods b
>>> ProperChild()
<__main__.ProperChild object at 0x00000225EEA46070>
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