在安装好Python3.8以后，并解决_ssl问题以后，开始安装pipenv，出现如下问题：

ERROR: Exception:
Traceback (most recent call last):
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_internal/cli/base_command.py", line 188, in _main
    status = self.run(options, args)
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_internal/commands/uninstall.py", line 54, in run
    session = self.get_default_session(options)
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_internal/cli/req_command.py", line 83, in get_default_session
    self._session = self.enter_context(self._build_session(options))
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_internal/cli/req_command.py", line 93, in _build_session
    session = PipSession(
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_internal/network/session.py", line 249, in __init__
    self.headers["User-Agent"] = user_agent()
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_internal/network/session.py", line 132, in user_agent
    zip(["name", "version", "id"], distro.linux_distribution()),
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_vendor/distro.py", line 125, in linux_distribution
    return _distro.linux_distribution(full_distribution_name)
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_vendor/distro.py", line 681, in linux_distribution
    self.version(),
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_vendor/distro.py", line 741, in version
    self.lsb_release_attr('release'),
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_vendor/distro.py", line 903, in lsb_release_attr
    return self._lsb_release_info.get(attribute, '')
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_vendor/distro.py", line 556, in __get__
    ret = obj.__dict__[self._fname] = self._f(obj)
  File "/usr/local/python3/lib/python3.8/site-packages/pip/_vendor/distro.py", line 1014, in _lsb_release_info
    stdout = subprocess.check_output(cmd, stderr=devnull)
  File "/usr/local/python3/lib/python3.8/subprocess.py", line 411, in check_output
    return run(*popenargs, stdout=PIPE, timeout=timeout, check=True,
  File "/usr/local/python3/lib/python3.8/subprocess.py", line 512, in run
    raise CalledProcessError(retcode, process.args,
subprocess.CalledProcessError: Command '('lsb_release', '-a')' returned non-zero exit status 1.

这个原因是因为电脑默认的Python3版本是3.4，安装3.8版本覆盖了3.4版本，导致系统默认的很多包无法使用；因此必须恢复之前的版本，然后重新安装3.8（不能覆盖/usr/local/python3这个目录，重新建一个目录/usr/local/python3.8）

如果不知道系统默认的Python3版本，可以利用

whereis python #查看Python所在的所有目录，里面能看到除了2.7半以后的3版本