我如何使用内省让Python告诉我更多关于PIL ImagingCore对象的信息?

我在PIL中做的事情是给我一个我不认识的类的对象。它可能是一个围绕C数据结构的相当薄的包装器。如何让Python告诉我在哪里查找更多信息?

以下是一些失败的尝试,试图利用内省来了解更多信息:

>>> import os, PIL
>>> obj = PIL.Image.open(os.path.expanduser("~/Desktop/foo.png")).getdata()
>>> type(obj)
<type 'ImagingCore'>
>>> ImagingCore
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'ImagingCore' is not defined
>>> PIL.ImagingCore
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: 'module' object has no attribute 'ImagingCore'
>>> obj.__class__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: __class__
>>> obj.__module__
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
AttributeError: __module__
>>> import inspect
>>> inspect.getsource(obj)
...
TypeError: <ImagingCore object at 0x105e64b50> is not a module, class, method, function, traceback, frame, or code object
>>> inspect.getsource(type(obj))
...TypeError: <module '__builtin__' (built-in)> is a built-in class
>>>