title: eval() does not assign variable at runtime
body: <p>I use <code>eval()</code> to assign a list to a var:</p>
  
  <pre><code>eval('mylist = [1,2,3]') 
  </code></pre>
  
  <p>but when I run it , I got a SyntaxError. What's wrong with it? If I cannot do assignment in the <code>eval()</code>, how do I assign a var in the runtime. </p>