title: changing alias to python3 in zsh
body: <p>I am using zsh shell and I am trying to change default python in my mac which is currently python2. </p>
  
  <p>I am getting the following:</p>
  
  <pre><code>➜ alias python = 'python3'
  zsh: bad assignment
  </code></pre>
  
  <p>Why is it happening? </p>