I find myself typing source venv/bin/activate a lot when switching between Python projects. I added this function to my .bash_profile. It checks if there’s a directory named venv (or virtualenv or whatever you use). If there is, it activates the virtual environment automagically.

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function cd {
    builtin cd "$@"
    if [ -d "venv" ] ; then
        source venv/bin/activate
    fi
}