{'id': ['001', '002', '003'], 'tag1': ['val1']}

[{'id': '001', 'tag1': 'val1'}, {'id': '002', 'tag1': 'val1'}, {'id': '003', 'tag1': 'val1'}]

pfilter = dict()
pfilter["id"] = ["001", "002", "003"]
pfilter["tag1"] = ["val1"]
print(pfilter)

all_values = list(itertools.product(*pfilter.values()))
all_keys = [pfilter.keys()]*len(all_values)
all_dict = [zip(keys, values) for keys, values in zip(all_keys, all_values)]
all_dict = [{k:v for k, v in item} for item in all_dict]
print(all_dict)