title: Most pythonic way to port this tuple unpacking with lambda from Python 2 into Python 3
body: <p>I have the following Python 2 code which unpacks a tuple inside a lambda. This lambda is contained inside a for loop.</p>
  
  <pre><code>    for lab, lab_pred, length in zip(labels, labels_pred, sequence_lengths):
          accs += map(lambda (a, b): a == b, zip(lab, lab_pred))
  </code></pre>
  
  <p>What is the best way to port this into Python 3?</p>