attrs.py

def hasattrs(obj, attrs):
    for attr in attrs.split('.'):
        if not hasattr(obj, attr):
            return False

        obj = getattr(obj, attr)

    return True


def getattrs(obj, attrs, *args):
    for attr in attrs.split('.'):
        if args:
            obj = getattr(obj, attr, args[0])

            if obj is args[0]:
                return obj
        else:
            obj = getattr(obj, attr)

    return obj
    
obj = SomeObject()
getattrs(obj, 'long.chain.of.attributes', None)