解决办法：ImportError: 'module' object has no attribute 'check_specifier'

　　安装scikit-image时出现错误：
 

 ImportError: 'module' object has no attribute 'check_specifier'
    
    ----------------------------------------
Command "python setup.py egg_info" failed with error code 1 in /tmp/pip-install-uBCsqy/subprocess32/

　　这怎么办……以下办法可以解决：

sudo pip install --upgrade setuptools==30.1.0