A strange bug in version 1.0.3


```python
# Your code here

import pandas as pd

```
#### Problem description
When I import pandas 1.03  in pycharm, an error message was returned. This error did not occur when I lowered the version of the package to 0.23.4. In addition, this error no occur in spyder .

Traceback (most recent call last):
  File "E:/coherenceestimation/code/venv/ROC_classifier.py", line 8, in <module>
    import pandas as pd
  File "D:\Users\ThinkPad\Anaconda3\envs\MeachineLing\lib\site-packages\pandas\__init__.py", line 124, in <module>
    from pandas.core.computation.api import eval
  File "D:\Users\ThinkPad\Anaconda3\envs\MeachineLing\lib\site-packages\pandas\core\computation\api.py", line 3, in <module>
    from pandas.core.computation.eval import eval
  File "D:\Users\ThinkPad\Anaconda3\envs\MeachineLing\lib\site-packages\pandas\core\computation\eval.py", line 14, in <module>
    from pandas.core.computation.engines import _engines
  File "D:\Users\ThinkPad\Anaconda3\envs\MeachineLing\lib\site-packages\pandas\core\computation\engines.py", line 9, in <module>
    from pandas.core.computation.ops import _mathops, _reductions
  File "D:\Users\ThinkPad\Anaconda3\envs\MeachineLing\lib\site-packages\pandas\core\computation\ops.py", line 17, in <module>
    from pandas.core.computation.scope import _DEFAULT_GLOBALS
  File "D:\Users\ThinkPad\Anaconda3\envs\MeachineLing\lib\site-packages\pandas\core\computation\scope.py", line 17, in <module>
    from pandas.compat.chainmap import DeepChainMap
  File "D:\Users\ThinkPad\Anaconda3\envs\MeachineLing\lib\site-packages\pandas\compat\chainmap.py", line 1, in <module>
    from typing import ChainMap, MutableMapping, TypeVar, cast
ImportError: cannot import name 'ChainMap'




