title: "reload ~/.bash_profile"error by installing virtualenvwrapper
body: <p>The virtualenvwrapper official documents ask me to add three lines to ~/.bash_profile, but I add three wrong lines to there, and then, there is an error looks like below after I reloaded by command<code>source ~/.bash_profile</code></p>
  
  <pre><code>/Users/donald/.bash_profile:1: bad assignment
  </code></pre>
  
  <p>Can anyone tell me how to do and why? and if someone can teach me how to install <strong>virtualenvwrapper</strong>? I have spent a whole night working on this and fail.</p>
  
  <p>The three wrong command lines are:</p>
  
  <pre><code>export WORKON_HOME=~/Envs
  mkdir -p $WORKON_HOME
  source /usr/local/bin/virtualenvwrapper.sh
  </code></pre>