python遍历字典所有的字段

def visit_dict(dt):    if isinstance(dt, dict):        for k in dt.keys():            if isinstance(dt[k], dict) or isinstance(dt[k], list):                visit_dict(dt[k])            else:                print k,dt[k]    elif isinstance(dt, list):        for obj in dt:            if isinstance(obj, dict) or isinstance(obj, list):                visit_dict(obj)