title: What does colon equal (:=) in Python mean?
body: <p>What does the <code>:=</code> operand mean, more specifically for Python?</p>
  
  <p>Can someone explain how to read this snippet of code?</p>
  
  <pre><code>node := root, cost = 0
  frontier := priority queue containing node only
  explored := empty set
  </code></pre>