无法导入最新的 (0.12.2) statsmodels.api：获取类型错误：需要一个整数（获取类型字节）

Question

无法导入 statsmodels.api as sm, 但是 import statsmodels 似乎可以工作并且安装了 0.12.2 版本的 statsmodles 包。但是如果没有 api，我真的无法使用 statsmodels。如果我在尝试调用 import statsmodels 时只是 statsmodels.api.OLS(y,x)，我会得到 AttributeError: module 'statsmodels' has no attribute 'api'。我在尝试 import statsmodels.api as sm 时遇到的主要错误粘贴在下面。注意：安装了所有最新的依赖项，我使用的是 python 3.8.5。

    Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\statsmodels\api.py", line 32, in <module>
    from .nonparametric import api as nonparametric
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\statsmodels\nonparametric\api.py", line 11, in <module>
    from .kernel_density import \
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\statsmodels\nonparametric\kernel_density.py", line 34, in <module>
    from ._kernel_base import GenericKDE, EstimatorSettings, gpke, \
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\statsmodels\nonparametric\_kernel_base.py", line 12, in <module>
    import joblib
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\joblib\__init__.py", line 119, in <module>
    from .parallel import Parallel
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\joblib\parallel.py", line 28, in <module>
    from ._parallel_backends import (FallbackToBackend, MultiprocessingBackend,
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\joblib\_parallel_backends.py", line 22, in <module>
    from .executor import get_memmapping_executor
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\joblib\executor.py", line 14, in <module>
    from .externals.loky.reusable_executor import get_reusable_executor
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\joblib\externals\loky\__init__.py", line 12, in <module>
    from .backend.reduction import set_loky_pickler
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\joblib\externals\loky\backend\reduction.py", line 125, in <module>
    from joblib.externals import cloudpickle  # noqa: F401
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\joblib\externals\cloudpickle\__init__.py", line 3, in <module>
    from .cloudpickle import *
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\joblib\externals\cloudpickle\cloudpickle.py", line 152, in <module>
    _cell_set_template_code = _make_cell_set_template_code()
  File "C:\Users\User.Name\AppData\Local\Programs\Python\Python38\lib\site-packages\joblib\externals\cloudpickle\cloudpickle.py", line 133, in _make_cell_set_template_code
    return types.CodeType(
TypeError: an integer is required (got type bytes)