jsonファイルのインポートエラー、TypeError expected string or buffer

import json

data = [{"a": 1, "b": 2, "c": 3, "d": 4, "e": 5}]
print(type(data),data)

json_string=json.dumps(s)

python_obj=json.loads(json_string)

import json

data = [{"a": 1, "b": 2, "c": 3, "d": 4, "e": 5}]
json_string = json.dumps(data) #dumps serializes to str, so it ensures that double quotes don't become single quotes
python_obj = json.loads(json_string) #oads deserialization, so the same as the original data
print(type(json_string),json_string)
print(type(python_obj),python_obj)