How many Harry Potter movies did Gilderoy Lockhart appear in?
{'directed': True, 'multigraph': False, 'graph': {}, 'nodes': [{'type': 'INTERNAL', 'name_': 'Q6581097', 'id': 0, 'label': 'male'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q216930', 'id': 1, 'label': 'Harry Potter'}, {'type': 'ANSWER_CANDIDATE_ENTITY', 'name_': 'Q643461', 'id': 2, 'label': 'Michael Goldenberg'}, {'type': 'QUESTIONS_ENTITY', 'name_': 'Q1114418', 'id': 3, 'label': 'Gilderoy Lockhart'}], 'links': [{'name_': 'P58', 'source': 1, 'target': 2, 'label': 'screenwriter'}, {'name_': 'P21', 'source': 2, 'target': 0, 'label': 'sex or gender'}, {'name_': 'P21', 'source': 3, 'target': 0, 'label': 'sex or gender'}]}