问Python3 pip升级和安装失败

EN

python3 -m pip install --upgrade pip
Exception:
Traceback (most recent call last):
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 215, in main
    status = self.run(options, args)
  File "/usr/lib/python3/dist-packages/pip/commands/install.py", line 290, in run
    with self._build_session(options) as session:
  File "/usr/lib/python3/dist-packages/pip/basecommand.py", line 69, in _build_session
    if options.cache_dir else None
  File "/usr/lib/python3.6/posixpath.py", line 80, in join
    a = os.fspath(a)
TypeError: expected str, bytes or os.PathLike object, not int

pip cache
ERROR: pip cache commands can not function since cache is disabled.