class="reference external" href="http://legacy.python.org/dev/peps/pep-0008/#programming-recommendations">PEP 8 Style Guide - Programming Recommendations</a></p></li>
<li><p><a class="reference external" href="http://stackoverflow.com/questions/25010167/e731-do-not-assign-a-lambda-expression-use-a-def">Stack Overflow - Do not assign a lambda expression</a></p></li>
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