写入文件：
with open('CustomerRanking.json', 'w', encoding='utf-8') as ff:
ff.write(str(data_dict))
读取文件：
with open('CustomerRanking.json', 'r', encoding='utf-8') as f:
t = f.read()
写入文件：
with open('CustomerRanking.json', 'w', encoding='utf-8') as ff:
ff.write(str(data_dict))
读取文件：
with open('CustomerRanking.json', 'r', encoding='utf-8') as f:
t = f.read()
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