我想连接 aliyun 的 odps，请问有示例代码吗？

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如题

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目前已经连接上了 odps，但是出现了新的问题

import os
from mschema.schema_engine import SchemaEngine
from sqlalchemy import create_engine

conn_string = 'odps://%s:%s@<project>/?endpoint=<endpoint>' % (
   os.getenv('ALIBABA_CLOUD_ACCESS_KEY_ID'),
   os.getenv('ALIBABA_CLOUD_ACCESS_KEY_SECRET'),
)
db_engine = create_engine(conn_string)
conn = db_engine.connect()
db_name = 'du_data_analysis'
# 2.Construct M-Schema
schema_engine = SchemaEngine(engine=db_engine, db_name=db_name)
mschema = schema_engine.mschema
mschema_str = mschema.to_mschema()
print(mschema_str)
mschema.save(f'./{db_name}.json')

# 3.Use for Text-to-SQL
dialect = db_engine.dialect.name
question = ''
evidence = ''
initial_prompt = """You are now a {dialect} data analyst, and you are given a database schema as follows:

【Schema】
{db_schema}

Please read and understand the database schema carefully, and generate an executable SQL based on the user's question and evidence. The generated SQL is protected by ```sql and ```.
""".format(dialect=dialect, db_schema=mschema_str)

print(f"propmt:\n {initial_prompt}")
# Replace the function call_llm() with your own function or method to interact with a LLM API.
# response = call_llm(prompt

我的代码如上所示，但是在这一行出现了报错：