Julia's questions

我全新安装了 Ubuntu 16.04.6，在安装了一些 python 包（如下所列）并输入 Python3 并键入import pandas后，我收到此错误：

myBashPrompt:~$ python3 
Python 3.5.2 (default, Oct  8 2019, 13:06:37) 
[GCC 5.4.0 20160609] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pandas
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/home/anon/.local/lib/python3.5/site-packages/pandas/__init__.py", line 55, in <module>
    from pandas.core.api import (
  File "/home/anon/.local/lib/python3.5/site-packages/pandas/core/api.py", line 5, in <module>
    from pandas.core.arrays.integer import (
  File "/home/anon/.local/lib/python3.5/site-packages/pandas/core/arrays/__init__.py", line 1, in <module>
    from .array_ import array  # noqa: F401
  File "/home/anon/.local/lib/python3.5/site-packages/pandas/core/arrays/array_.py", line 7, in <module>
    from pandas.core.dtypes.common import (
  File "/home/anon/.local/lib/python3.5/site-packages/pandas/core/dtypes/common.py", line 11, in <module>
    from pandas.core.dtypes.dtypes import (
  File "/home/anon/.local/lib/python3.5/site-packages/pandas/core/dtypes/dtypes.py", line 53, in <module>
    class Registry:
  File "/home/anon/.local/lib/python3.5/site-packages/pandas/core/dtypes/dtypes.py", line 84, in Registry
    self, dtype: Union[Type[ExtensionDtype], str]
  File "/usr/lib/python3.5/typing.py", line 552, in __getitem__
    dict(self.__dict__), parameters, _root=True)
  File "/usr/lib/python3.5/typing.py", line 512, in __new__
    for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
  File "/usr/lib/python3.5/typing.py", line 512, in <genexpr>
    for t2 in all_params - {t1} if not isinstance(t2, TypeVar)):
  File "/usr/lib/python3.5/typing.py", line 1077, in __subclasscheck__
    if super().__subclasscheck__(cls):
  File "/usr/lib/python3.5/abc.py", line 225, in __subclasscheck__
    for scls in cls.__subclasses__():
TypeError: descriptor '__subclasses__' of 'type' object needs an argument 

如何解决此问题或避免此错误？
上次我发这个的时候，我以为是因为我升级了 Ubuntu。升级不是问题。这些是我安装的其他软件包。

pip3 install pygame
pip3 install pymunk
pip3 install numpy
pip3 install matplotlib==3.0.3 #installed older version because new version requires python3.6
pip3 install scipy
pip3 install PyQt5
sudo pip3 install pyqtgraph
sudo apt-get install openmpi-bin
pip3 install cntk
pip3 install h5py
sudo pip3 install keras
pip3 install visvis --user
pip3 install seaborn --user
pip3 install pandas

这适用于 Ubuntu 16.04。在安装过程中，如果计算机已连接到 Internet，则可以选择在安装过程中下载软件包。我选择了该选项并且安装进行得很好。

在安装过程中下载了许多这样的包后，我当天的互联网配额到期，并且由于无法再访问互联网，Ubuntu不得不停止下载它正在下载的任何包，并表示安装成功完成。

现在 Ubuntu 正在启动并且工作正常，但我想知道如何确保它打算下载和安装的软件包现在可以被下载和安装。仅仅是使用 Ubuntu 软件更新的问题吗？

或者，如果我在未连接到 Internet 时安装 Ubuntu，然后想安装连接到 Internet 时会安装的软件包，我该怎么做？通过 Ubuntu 软件更新包？或者是否需要确切知道要下载和安装哪些软件包？