title: why if-statement not shown in opcode?
body: <p>Here is a simple sample:</p>
  <pre class="lang-py prettyprint-override"><code>&gt;&gt;&gt; def foo():
  ...     if True:
  ...             return 'yes'
  ... 
  &gt;&gt;&gt; import dis
  &gt;&gt;&gt; dis.dis(foo)
    3           0 LOAD_CONST               1 ('yes')
                2 RETURN_VALUE
  
  </code></pre>
  <p>Why does here not have bytecode about if-statement? It just directly return value.</p>
  <ul>
  <li>CPython3.6</li>
  </ul>