python - 我可以在激活/停用 virtualenv 时自动更改我的 PYTHONPATH 吗？

Question

我想在特定的 virtualenv 中使用与我平时不同的 PYTHONPATH。如何自动设置？我意识到可以破解bin/activate文件，有更好/更标准的方法吗？

Answer 1

这篇django-users 帖子可能会对您有很大帮助。它建议使用virtualenvwrapper来包装 virtualenv，以使用add2virtualenv命令。使用它，当环境处于活动状态时，您只需调用：

add2virtualenv directory1 directory2 ...

将目录添加到当前环境的 pythonpath 中。

它自主处理环境开关上的 PATH 更改。不需要黑魔法。瞧！

Answer 2

这是 hacked 版本bin/activate供参考。它正确设置了 PYTHONPATH，但取消设置不起作用。

# This file must be used with "source bin/activate" *from bash*
# you cannot run it directly

deactivate () {
    if [ -n "$_OLD_VIRTUAL_PATH" ] ; then
        PATH="$_OLD_VIRTUAL_PATH"
        export PATH
        unset _OLD_VIRTUAL_PATH
    fi  

    # This should detect bash and zsh, which have a hash command that must
    # be called to get it to forget past commands.  Without forgetting
    # past commands the $PATH changes we made may not be respected
    if [ -n "$BASH" -o -n "$ZSH_VERSION" ] ; then
        hash -r
    fi  

    if [ -n "$_OLD_VIRTUAL_PS1" ] ; then
        PS1="$_OLD_VIRTUAL_PS1"
        export PS1 
        unset _OLD_VIRTUAL_PS1
    fi  

    if [ -n "$_OLD_PYTHONPATH" ] ; then
        PYTHONPATH="$_OLD_PYTHONPATH"
        export PYTHONPATH 
        unset _OLD_PYTHONPATH
    fi  

    unset VIRTUAL_ENV
    if [ ! "$1" = "nondestructive" ] ; then
    # Self destruct!
        unset deactivate
    fi  
}

# unset irrelavent variables
deactivate nondestructive
VIRTUAL_ENV="env_location" # Anonymized
export VIRTUAL_ENV

_OLD_VIRTUAL_PATH="$PATH"
PATH="$VIRTUAL_ENV/bin:$PATH"
export PATH

_OLD_VIRTUAL_PS1="$PS1"
if [ "`basename \"$VIRTUAL_ENV\"`" = "__" ] ; then
    # special case for Aspen magic directories
    # see http://www.zetadev.com/software/aspen/
    PS1="[`basename \`dirname \"$VIRTUAL_ENV\"\``] $PS1"
else
    PS1="(`basename \"$VIRTUAL_ENV\"`)$PS1"
fi
export PS1

# This should detect bash and zsh, which have a hash command that must
# be called to get it to forget past commands.  Without forgetting
# past commands the $PATH changes we made may not be respected
if [ -n "$BASH" -o -n "$ZSH_VERSION" ] ; then
    hash -r
fi

_OLD_PYTHONPATH="$PYTHONPATH"
PYTHONPATH="new_pythonpath" #Anonymized
export PYTHONPATH