python 3rd library通常會撞到：python_path/lib/python3.4/site-packages

以安裝ipython為例

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#安裝/反安裝package
pip install ipython
pip uninstall ipython
#找出ipython安裝在哪
pip show --files ipython
#更新package
pip install --upgrade ipython
#列出哪些package需要更新
pip list --outdated