Decorator to prevent base class methods from being called directly.
from virtualmethod import virtualmethod class Base(object): @virtualmethod def my_virtual_method(self): print "This is a virtual method. Call me from a subclass!" class A(Base): pass class B(Base): def my_virtual_method(self): print "I went ahead and implemented my own version." base = Base() a = A() b = B() a.my_virtual_method() -> This is a virtual method. Call me from a subclass! b.my_virtual_method() -> I went ahead and implemented my own version. base.my_virtual_method() -> Traceback (most recent call last): File "<stdin>", line 1, in <module> File "virtualmethod/core.py", line 11, in __call__ raise TypeError("Virtual method %s must be called from a subclass." % self.__name__) TypeError: Virtual method my_virtual_method must be called from a subclass.
@virtualmethod works with
@staticmethod, but must be
declared first, i.e.:
@virtualmethod @classmethod def my_virtual_class_method(cls): ...