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a = [{'shunxu': 33.0,'bianhao': 2.0,'chuanbo': 10.0,}, {'shunxu': 17.0,'bianhao': 6.0,'chuanbo': 6.0,}]
b = [{'shunxu': 17.0,'bay': 5,"chuanbo": 6.0,}, {'shunxu': 33.0,'bay': 15,'chuanbo': 6.0,}]
[[i.setdefault('bay', j['bay']) for j in b if i['shunxu'] == j['shunxu']] for i in a ]
print(a)