Python check instances of classes
isinstance() is your friend here. It returns a boolean and can be used in the following ways to check types.
if isinstance(obj, (int, long, float, complex)):
print obj, "is a built-in number type"
if isinstance(obj, MyClass):
print obj, "is of type MyClass"
Hope this helps.
Have you tried isinstance() built in function?
You could also look at hasattr(obj, '__class__') to see if the object was instantiated from some class type.