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Traceback (most recent call last):
  File "pg2drg2pg.py", line 259, in post2DrgAndGetSql
    data = json.dumps(i_params)
  File "/usr/local/python3/lib/python3.6/json/__init__.py", line 231, in dumps
    return _default_encoder.encode(obj)
  File "/usr/local/python3/lib/python3.6/json/encoder.py", line 199, in encode
    chunks = self.iterencode(o, _one_shot=True)
  File "/usr/local/python3/lib/python3.6/json/encoder.py", line 257, in iterencode
    return _iterencode(o, 0)
  File "/usr/local/python3/lib/python3.6/json/encoder.py", line 180, in default
    o.__class__.__name__)
TypeError: Object of type 'Decimal' is not JSON serializable

解决方案：

在代码里面加上

class DecimalEncoder(json.JSONEncoder):
    def default(self, o):
        if isinstance(o, decimal.Decimal):
            return float(o)
        super(DecimalEncoder, self).default(o)

data = json.dumps(i_params,cls=DecimalEncoder)

 发现程序正常运行