Converting a massive into a 3 dimensional bitmap Question: Problem I need this massive to serve as an input (for C based arduino). This is our massive from the example above in the required format: const byte bitmap[8][8] = { {0xFF, 0x81, 0x81, 0x81, 0x81, 0x81, 0x81, 0xFF}, {0x81, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, …
Python abstract base classes, difference between a mixin & abstract method Question: The table below displays various abstract base classes that are prevalent throughout Python. However, I am uncertain about their specific usage in this context. Can you explain the distinction between the ‘Abstract Methods’ column and the ‘Mixin Methods’ column? Are the methods in …
ForeignKey field related to abstract model in Django Question: I have this model: class BaseModel(models.Model): …. class Meta: abstract = True class ModelA(BaseModel): …. class ModelB(BaseModel): …. class MyExtModel(models.Model) myfield = models.ForeignKey(BaseModel) But this is not correct because I have BaseModel like Abstract. Infact I have an error when I try makemigration command. The error …
Abstract attribute (not property)? Question: What’s the best practice to define an abstract instance attribute, but not as a property? I would like to write something like: class AbstractFoo(metaclass=ABCMeta): @property @abstractmethod def bar(self): pass class Foo(AbstractFoo): def __init__(self): self.bar = 3 Instead of: class Foo(AbstractFoo): def __init__(self): self._bar = 3 @property def bar(self): return self._bar …
Is it possible to make abstract classes? Question: How can I make a class or method abstract in Python? I tried redefining __new__() like so: class F: def __new__(cls): raise Exception("Unable to create an instance of abstract class %s" %cls) But now, if I create a class G that inherits from F like so: class …
Abstract methods in Python Question: I am having trouble in using inheritance with Python. While the concept seems too easy for me in Java yet up till now I have been unable to understand in Python which is surprising to me at least. I have a prototype which follow: class Shape(): def __init__(self, shape_name): self.shape …
