我正在尝试让 virtualenvwrapper 运行。我安装它：
sudo pip install virtualenvwrapper
我像这样编辑了 .bashrc：
export WORKON_HOME=$HOME/.virtualenvs
export PROJECT_HOME=$HOME/Devel
export VIRTUALENVWRAPPER_SCRIPT=/usr/local/bin/virtualenvwrapper.sh
当我尝试运行“source ~/.bashrc”时，出现此错误：
/usr/bin/python: No module named virtualenvwrapper
virtualenvwrapper.sh: There was a problem running the initialization hooks.
If Python could not import the module virtualenvwrapper.hook_loader,
check that virtualenvwrapper has been installed for
VIRTUALENVWRAPPER_PYTHON=/usr/bin/python and that PATH is
set properly.
我在以下目录中安装了 pip、python 和 virtualenv：
which python
/usr/bin/python
which pip
/usr/bin/pip
which virtualenv
/usr/local/bin/virtualenv
我究竟做错了什么？