使用Python工厂习语

以下是一个模式：https://python-3-patterns-idioms-test.readthedocs.io/en/latest/Factory.html.我的问题是,这仍然是在Python 3.x中进行通用对象创建的最佳习惯用法/模式吗？我似乎无法在这个主题上找到太多.代码如下：

class Shape(object):
    # Create based on class name:
    def factory(type):
        #return eval(type + "()")
        if type == "Circle": return Circle()
        if type == "Square": return Square()
        assert 0, "Bad shape creation: " + type
    factory = staticmethod(factory)

class Circle(Shape):
    def draw(self): print("Circle.draw")
    def erase(self): print("Circle.erase")

class Square(Shape):
    def draw(self): print("Square.draw")
    def erase(self): print("Square.erase")

# Generate shape name strings:
def shapeNameGen(n):
    types = Shape.__subclasses__()
    for i in range(n):
        yield random.choice(types).__name__

shapes = \
  [ Shape.factory(i) for i in shapeNameGen(7)]

for shape in shapes:
    shape.draw()
    shape.erase()

您也可以使用__class__方法创建工厂,我也注意到了,但我不确定使用它的最佳方法.

解决方法:

我可能会遗漏一些东西,但我不喜欢这种模式.

你已经有Circle和Square的工厂 – Circle和Square.

标签：python,python-3-x,factory,factory-pattern
来源： https://codeday.me/bug/20190705/1387679.html