Silence PyLint warning about unused variables for string interpolation
<p>The <code>say</code> module brings string interpolation to Python, like this:</p>

<pre><code>import say

def f(a):
    return say.fmt("The value of 'a' is {a}")
</code></pre>

<p>However, PyLint complains that the variable 'a' is never used.  This is a problem because my code uses <code>say.fmt</code> extensively.  How can I silence this warning?</p>