title: Python's equivalent to null-conditional operator introduced in C# 6
body: <p>Is there an equivalent in Python to C# <a href="https://msdn.microsoft.com/en-us/library/dn986595.aspx" rel="noreferrer">null-conditional operator</a>?</p>
  
  <pre><code>System.Text.StringBuilder sb = null;
  string s = sb?.ToString(); // No error
  </code></pre>