In the following code, I create a base abstract class Base. I want all the classes that inherit from Base to provide the name property, so I made this property an @abstractmethod.
Then I created a subclass of Base, called Base_1, which is meant to supply some functionality, but still remain abstract. There is no name property in Base_1, but nevertheless python instatinates an object of that class without an error. How does one create abstract properties?
from abc import ABCMeta, abstractmethodclass Base(object):# class Base(metaclass = ABCMeta): <- Python 3 __metaclass__ = ABCMeta def __init__(self, str_dir_config): self.str_dir_config = str_dir_config @abstractmethod def _do_stuff(self, signals): pass @property @abstractmethod def name(self):"""This property will be supplied by the inheriting classes individually.""" passclass Base1(Base): __metaclass__ = ABCMeta"""This class does not provide the name property and should raise an error.""" def __init__(self, str_dir_config): super(Base1, self).__init__(str_dir_config) # super().__init__(str_dir_config) <- Python 3 def _do_stuff(self, signals): print "Base_1 does stuff" # print("Base_1 does stuff") <- Python 3class C(Base1): @property def name(self): return "class C"if __name__ == "__main__": b1 = Base1("abc")
