Functions that use ``++yield++`` are known as "generators". Before Python 3.3, generators cannot ``++return++`` values. Similarly, functions that use ``++return++`` cannot use ``++yield++``. Doing so will cause a ``++SyntaxError++``. Either upgrade your version of Python to a version >= 3.3, or don't use both return and yield in a function. == Noncompliant Code Example ---- def adder(n): num = 0 while num < n: yield num num += 1 return num #Noncompliant ---- ifdef::env-github,rspecator-view[] ''' == Implementation Specification (visible only on this page) include::message.adoc[] ''' == Comments And Links (visible only on this page) include::comments-and-links.adoc[] endif::env-github,rspecator-view[]