【代码报错】NameError: name 'D' is not defined

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NameError Traceback (most recent call last)

Cell In[17], line 2

  1 # 获取股票代

----> 2 D.instruments(start_date='2015-01-01', end_date='2016-01-01', market='CN_FUND')

NameError: name 'D' is not defined