问“DataFrame”对象没有属性“convert_objects”

EN

data = data.replace("?", np.nan)
data = data.convert_objects(convert_numeric=True)

data.isnull().sum()

AttributeError                            Traceback (most recent call last)
<ipython-input-7-1cfce90286bb> in <module>()
      2 
      3 data = data.replace("?", np.nan)
----> 4 data = data.convert_objects(convert_numeric=True)
      5 
      6 data.isnull().sum()

/usr/local/lib/python3.7/dist-packages/pandas/core/generic.py in __getattr__(self, name)
   5139             if self._info_axis._can_hold_identifiers_and_holds_name(name):
   5140                 return self[name]
-> 5141             return object.__getattribute__(self, name)
   5142 
   5143     def __setattr__(self, name: str, value) -> None:

AttributeError: 'DataFrame' object has no attribute 'convert_objects