human
Can you provide a the Python program you requested given the following:
Complete the below
def _tgrep_node_label_pred_use_action(_s, _l, tokens):

    ''''Builds a lambda function representing a predicate on a tree node
    which describes the use of a previously bound node label.
    Called for expressions like (`tgrep_node_label_use_pred`)::
    =s
    when they appear inside a tgrep_node_expr (for example, inside a
    relation).  The predicate returns true if and only if its node
    argument is identical the the node looked up in the node label
    dictionary using the node\'s label.'
    '''
assistant
#Here is the Python program you requested.
    assert (len(tokens) == 1)
    assert tokens[0].startswith(u'=')
    node_label = tokens[0][1:]
    def node_label_use_pred(n, m=None, l=None):
        if ((l is None) or (node_label not in l)):
            raise TgrepException(u'node_label    ={0}    not    bound    in    pattern'.format(node_label))
        node = l[node_label]
        return (n is node)
    return node_label_use_pred