(1) 运行 Windows 8 (2) 下载安装，Anaconda for Windows，PYTHON 2.7
(3) 从 Anaconda 提示：
conda install scikit-learn
Fetching package metadata: ....
Solving package specifications: .....................
All requested packages already installed.
packages in environment at C:\Users\Joey\Anaconda2:
scikit-learn 0.17 np110py27_1
(4) 推出Spyder
(5) 这样就ok了，包找到了。
import sklearn
(6) sklearn 的 Tab 补全（在 Spyder 中），显示：
sklearn.base
sklearn.clone
sklearn.externals
sklearn.re
sklearn.setup_module
sklearn.sys
sklearn.utils
sklearn.warnings
(6) 因此，当运行http://scikit-learn.org/stable/示例中的代码片段时。
from sklearn import DecisionTreeRegressor
Traceback (most recent call last):
File "<ipython-input-2-5aa62260685f>", line 1, in <module>
from sklearn import …