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virtualenvごとにPYTHONPATHを切り替える

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Python環境をvirtualenvを使って管理している場合に、環境変数PYTHONPATHをvirtualenvごとに切り替える方法です。

virtualenv_home/your_env/bin/activateに以下の2行を追加します。

activate
export OLD_PYTHONPATH=$PYTHONPATH
export PYTHONPATH="/path/to/you/want"

virtualenv_home/your_env/bin/postdeactivateに以下の2行を追加します。

postdeactivate
export PYTHONPATH=$OLD_PYTHONPATH
unset OLD_PYTHONPATH
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