human
I wrote the below code

    def CheckDictionary(C):
        C.newClassAttr = 'xyz'
        AreEqual(C.newClassAttr, 'xyz')
        a = C()
        a.__dict__[1] = '1'
        if (object in C.__bases__):
            try:
                C.__dict__[2] = '2'
                AssertUnreachable()
            except TypeError:
                pass
            AreEqual(C.__dict__.has_key(2), False)
        AreEqual(a.__dict__.has_key(1), True)
        AreEqual(dir(a).__contains__(1), True)
        AreEqual(repr(a.__dict__), "{1:    '1'}")
        C.newTypeAttr = 1
        AreEqual(hasattr(C, 'newTypeAttr'), True)
        class OldClass:
            pass
        if isinstance(C, type(OldClass)):
            C.__dict__ = dict(C.__dict__)
            AreEqual(hasattr(C, 'newTypeAttr'), True)
        else:
            try:
                C.__dict__ = {}
                AssertUnreachable()
            except AttributeError:
                pass
        a.newInstanceAttr = 1
        AreEqual(hasattr(a, 'newInstanceAttr'), True)
        a.__dict__ = dict(a.__dict__)
        AreEqual(hasattr(a, 'newInstanceAttr'), True)
        a.abc = 'xyz'
        AreEqual(hasattr(a, 'abc'), True)
        AreEqual(getattr(a, 'abc'), 'xyz')
    class OldClass:
        def __init__(self):
            pass
    class NewClass(object, ):
        def __init__(self):
            pass
    CheckDictionary(OldClass)
    CheckDictionary(NewClass)

What's a good function header?
 ... Here's a good function header?
assistant
#Here's a good function header.

def test_check_dictionary():