我刚刚在Mac OS（High Sierra）上重新安装了python3（3.6.5_1），pip3无法正常工作。 pip3出现以下错误：
Traceback (most recent call last):
File "/usr/local/bin/pip3", line 11, in <module>
load_entry_point('pip==10.0.1', 'console_scripts', 'pip3')()
File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 476, in load_entry_point
return get_distribution(dist).load_entry_point(group, name)
File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2700, in load_entry_point
return ep.load()
File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2318, in load
return self.resolve()
File "/usr/local/lib/python3.6/site-packages/pkg_resources/__init__.py", line 2324, in resolve
module = __import__(self.module_name, fromlist=['__name__'], level=0)
File "/usr/local/lib/python3.6/site-packages/pip/_internal/__init__.py", line 42, in <module>
from pip._internal import cmdoptions
File "/usr/local/lib/python3.6/site-packages/pip/_internal/cmdoptions.py", line 16, in <module>
from pip._internal.index import (
File "/usr/local/lib/python3.6/site-packages/pip/_internal/index.py", line 39, in <module>
from pip._internal.wheel import Wheel, wheel_ext
File "/usr/local/lib/python3.6/site-packages/pip/_internal/wheel.py", line 7, in <module>
import compileall
File "/usr/local/Cellar/python/3.6.5_1/Frameworks/Python.framework/Versions/3.6/lib/python3.6/compileall.py", line 20, in <module>
from concurrent.futures import ProcessPoolExecutor
File "/Library/Python/2.7/site-packages/concurrent/futures/__init__.py", line 8, in <module>
from concurrent.futures._base import (FIRST_COMPLETED,
File "/Library/Python/2.7/site-packages/concurrent/futures/_base.py", line 357
raise type(self._exception), self._exception, self._traceback
^
SyntaxError: invalid syntax
which pip3返回/usr/local/bin/pip3
我已经搜索，找不到解决方案。