環境:OSX Yosemite 10.10.3 Python : 2.7 機械学習のライブラリscikit-learnを利用しようとしたとき $ pip install -U scikit-learn (省略) Successfully installed sklearn Cleaning up... で見事インストール成功かとおもいきや $ python Python 2.7.6 (default, Sep 9 2014, 15:04:36) [GCC 4.2.1 Compatible Apple LLVM 6.0 (clang-600.0.39)] on darwin Type "help", "copyright", "credits" or "license" for more information. >>> from sklearn import datasets Traceb