[Python知识库]ubuntu16.04下使用conda命令提示错SyntaxError: invalid syntax解决方法

可能是因为我自己手动下载了Python3.6后，导致Pip3软连接紊乱，后来pip3坏了不是很好用，重装之后也没使得conda恢复。
我当时的情况是终端输入python，会显示：

Python 3.7.4 (default, Aug 13 2019, 20:35:49) 
[GCC 7.3.0] :: Anaconda, Inc. on linux
Type "help", "copyright", "credits" or "license" for more information.

但是输入conda的任何指令例如：conda list、conda --version等都会显示：

Traceback (most recent call last):
  File "/home/k/anaconda3/bin/conda", line 13, in <module>
    sys.exit(main())
  File "/home/k/anaconda3/lib/python3.7/site-packages/conda/cli/main.py", line 149, in main
    from ..exceptions import conda_exception_handler
  File "/home/k/anaconda3/lib/python3.7/site-packages/conda/exceptions.py", line 25, in <module>
    from .common.io import dashlist, timeout
  File "/home/k/anaconda3/lib/python3.7/site-packages/conda/common/io.py", line 7, in <module>
    from concurrent.futures import ProcessPoolExecutor, ThreadPoolExecutor, Executor, Future, _base, as_completed  # NOQA
  File "/usr/lib/python2.7/dist-packages/concurrent/futures/__init__.py", line 8, in <module>
    from concurrent.futures._base import (FIRST_COMPLETED,
  File "/usr/lib/python2.7/dist-packages/concurrent/futures/_base.py", line 357
    raise type(self._exception), self._exception, self._traceback
                               ^
SyntaxError: invalid syntax

受教于此文，我在终端输入：

unset PYTHONPATH

将python的路径都消掉了，后恢复原状