human
Complete this python program:
def _deep_annotate(element, annotations, exclude=None):
assistant
#Here is the Python code you requested.

    """Deep copy the given ClauseElement, annotating each element
    with the given annotations dictionary.
    Elements within the exclude collection will be cloned but not annotated.
    """
    def clone(elem):
        if (exclude and hasattr(elem, 'proxy_set') and elem.proxy_set.intersection(exclude)):
            newelem = elem._clone()
        elif (annotations != elem._annotations):
            newelem = elem._annotate(annotations)
        else:
            newelem = elem
        newelem._copy_internals(clone=clone)
        return newelem
    if (element is not None):
        element = clone(element)
    return element