我有一个组件对象库。我想在另一个对象中包含对这些对象的选择的实例化。但我想将该选择作为列表提供,以便每次使用列表实例化容器对象时,都会使用其中的指定子对象创建它。
假设我的组件库如下所示:
class ColorBlob(object):
...
def wipeItUp()
...
class RedBlob(ColorBlob):
...
def paintIt()
...
class YellowBlob(ColorBlob):
...
def paintIt()
...
class BlueBlob(ColorBlob):
...
def paintIt()
...
我的容器对象如下所示:
class Pallet(object):
def __init__(self, colorList):
for color in colorList:
#Ok, here is where I get lost if I know the color I can do this:
Pallet.BlueBlob = blobLib.BlueBlob()
#But I don't, so I am trying to do something like this:
blobSpecs = getattr(blobLib, color)
blobSpecs.Obj = blobSpecs().returnObj(self.page) # with "returnObj" defined in the library as some other method
setattr(self, Pallet.blobName, blobSpecs) #and I am completely lost.
但我在功能代码中真正想做的是:
workingPallet=Pallet(['RedBlob', 'BlueBlob'])
workingPallet.RedBlob.paintIt()
我知道当我尝试在容器中实例化子对象时,我迷失了。有人能帮助我理顺我的“getattr”和“setattr”废话吗?
答案 0 :(得分:2)
你几乎就在那里,但不是你的getattr
或setattr
问题。您最终将该类设置回self
,而不是您创建的实例:
def __init__(self, colorList):
for color in colorList:
blobSpec = getattr(blobLib, color)
blob = blobSpec() # create an instance of the blob
blob.Obj = blob.returnObj(self.page)
setattr(self, color, blob)
与直接调用类(BlueBlob()
)完全相同,但现在通过变量调用。