python---pip install 失败解决方法

python版本为3.5.2，采用pip install paramiko失败，报错如下：
Traceback (most recent call last):
File "c:\program files (x86)\python35-32\lib\site-packages\pip_vendor\pkg_res
ources_init_.py", line 2851, in _dep_map
return self._dep_map
File "c:\program files (x86)\python35-32\lib\site-packages\pip_vendor\pkg_res
ources_init.py", line 2685, in getattr
raise AttributeError(attr)
AttributeError: _DistInfoDistribution__dep_map

解决方法：
升级pip版本。命令如下：
pip install --upgrade pip 。