ImportError: No module named xgboost

当我尝试从Python终端导入时，尽管我按照安装xgboost的所有步骤操作，但Python无法获取包的详细信息。我对Python相对陌生，但我可以轻松安装numpy和pandas包，我使用了这个链接在MACOSX上进行安装 http://xgboost.readthedocs.io/en/latest/build.html

>>> import xgboost
   Traceback (most recent call last):
   File "", line 1, in 
   ImportError: No module named xgboost

当我使用pip install xgboost时，我得到了以下错误：

Command "python setup.py egg_info" failed with error code 1 in /private/var/folders/h7/pyph_7qj6171tqp50cf2xc7m0000gn/T/pip-build-TEvbD6/xgboost/ 

打印sys路径时，我得到了以下结果：

print sys.path

['', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python27.zip', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-darwin', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/plat-mac/lib-scriptpackages', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-old', '/System/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload', '/Library/Python/2.7/site-packages', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python', '/System/Library/Frameworks/Python.framework/Versions/2.7/Extras/lib/python/PyObjC']