title: Split long conditional expressions to lines
body: <p>I have some if statements like:</p>
  
  <pre><code>def is_valid(self):
      if (self.expires is None or datetime.now() &lt; self.expires)
      and (self.remains is None or self.remains &gt; 0):
          return True
      return False
  </code></pre>
  
  <p>When I type this expressions my Vim automatically moves <code>and</code> to new line with this same indent as <code>if</code> line . I try more indent combinations, but validating always says thats invalid syntax. How to build long if's?</p>