Python pipenv 2020.6.2版无法安装某些软件包？pip3能够安装相同的软件包pipenv can''；T

我很想使用pipenv，但有两个软件包给我带来了问题？ 在过去2年多的时间里，似乎有几篇类似的帖子，但我找不到真正的答案。 我得到了最新版本的pipenv（2020.6.2），并要求安装最新的cffi软件包（1.14.1）

在此处输入代码

（参见下面的示例）

#pipenv版本

pipenv——版本 pipenv，版本2020.6.2

#在pipenv之外，使用pip3时，一切都正常运行

pip3安装cffi==1.14.1

Requirement already satisfied: cffi==1.14.1 in /home/john/.local/lib/python3.8/site-packages (1.14.1)
Requirement already satisfied: pycparser in /home/john/.local/lib/python3.8/site-packages (from cffi==1.14.1) (2.20)

问题示例：

pipenv安装cffi==1.14.1

Error:  An error occurred while installing cffi==1.14.1!
Error text:
Traceback (most recent call last):
  File "/home/john/.local/share/virtualenvs/06-Login-Auth-HAdzgzLT/bin/pip", line 5, in <module>
    from pip._internal.cli.main import main
  File "/home/john/.local/share/virtualenvs/06-Login-Auth-HAdzgzLT/lib/python3.8/site-packages/pip/_internal/cli/main.py", line 10, in <module>
    from pip._internal.cli.autocompletion import autocomplete
  File "/home/john/.local/share/virtualenvs/06-Login-Auth-HAdzgzLT/lib/python3.8/site-packages/pip/_internal/cli/autocompletion.py", line 9, in <module>
    from pip._internal.cli.main_parser import create_main_parser
  File "/home/john/.local/share/virtualenvs/06-Login-Auth-HAdzgzLT/lib/python3.8/site-packages/pip/_internal/cli/main_parser.py", line 7, in <module>
    from pip._internal.cli import cmdoptions
  File "/home/john/.local/share/virtualenvs/06-Login-Auth-HAdzgzLT/lib/python3.8/site-packages/pip/_internal/cli/cmdoptions.py", line 25, in <module>
    from pip._internal.locations import USER_CACHE_DIR, get_src_prefix
  File "/home/john/.local/share/virtualenvs/06-Login-Auth-HAdzgzLT/lib/python3.8/site-packages/pip/_internal/locations.py", line 19, in <module>
    from pip._internal.utils import appdirs
  File "/home/john/.local/share/virtualenvs/06-Login-Auth-HAdzgzLT/lib/python3.8/site-packages/pip/_internal/utils/appdirs.py", line 13, in <module>
    from pip._vendor import appdirs as _appdirs
ImportError: cannot import name 'appdirs' from 'pip._vendor' (/home/john/.local/share/virtualenvs/06-Login-Auth-HAdzgzLT/lib/python3.8/site-packages/pip/_vendor/__init__.py)

错误：安装cffi==1.14.1时出错！
错误文本：
回溯（最近一次呼叫最后一次）：
文件“/home/john/.local/share/virtualenvs/06登录验证HAdzgzLT/bin/pip”，第5行，在
从pip.\u internal.cli.main导入main
文件“/home/john/.local/share/virtualenvs/06 Login Auth HAdzgzLT/lib/python3.8/site packages/pip/_internal/cli/main.py”，第10行，在
从pip.\u internal.cli.autocompletion导入自动完成
文件“/home/john/.local/share/virtualenvs/06 Login Auth HAdzgzLT/lib/python3.8/site packages/pip/_internal/cli/autocompletion.py”，第9行，在
从pip.\u internal.cli.main\u解析器导入创建\u main\u解析器
文件“/home/john/.local/share/virtualenvs/06 Login Auth HAdzgzLT/lib/python3.8/site packages/pip/_internal/cli/main_parser.py”，第7行，在
从pip.\u internal.cli导入cmdoptions
文件“/home/john/.local/share/virtualenvs/06 Login Auth HAdzgzLT/lib/python3.8/site packages/pip/_internal/cli/cmdoptions.py”，第25行，在
从pip.\u internal.locations导入用户\u CACHE\u DIR，获取\u src\u前缀
文件“/home/john/.local/share/virtualenvs/06 Login Auth HAdzgzLT/lib/python3.8/site packages/pip/_internal/locations.py”，第19行，在
从pip.\u internal.utils导入应用程序
文件“/home/john/.local/share/virtualenvs/06 Login Auth HAdzgzLT/lib/python3.8/site packages/pip/_internal/utils/appdirs.py”，第13行，在
从pip.\u供应商将AppDir导入为\u AppDir
ImportError:无法从“pip.\u供应商”导入名称“appdirs”（/home/john/.local/share/virtualenvs/06 Login Auth HAdzgzLT/lib/python3.8/site packages/pip/\u vendor/\u init\uuuuuuuuuuuuuu.py）