Nomodulenamed pip._internal怎么解决

报错：

root@iZc3hwgbd4qbmwZ:~# pip install oss2
Traceback (most recent call last):
File "/usr/local/bin/pip", line 7, in <module>
from pip._internal import main
ImportError: No module named 'pip._internal'

解决方法：

重新安装pip

执行下面两条命令：

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python2.7  get-pip.py --force-reinstall

curl https://bootstrap.pypa.io/get-pip.py -o get-pip.py
python3.5 get-pip.py --force-reinstall

http://www.cnblogs.com/heiao10duan/p/9399858.html

卸载python2.7   sudo apt-get remove python-pip