title: Unable to use *= python operator in list comprehension
body: <p>I'm not sure why I'm unable to use the <code>*=</code> operator in a list comprehension, when using it in a <code>for</code> loop is fine?</p>
  
  <pre><code>def funcLC(l):
      ans = 1
      [ans *= x for x in l if x &lt; 0]
      return ans
  
  SyntaxError: invalid syntax
  
  def funcFor(l):
      ans = 1
      for x in l:
          if x &lt; 0:
              start *= x
      return ans
  </code></pre>