title: product of two functions
body: <p>I have two functions, <code>f</code> and <code>g</code>. Both have the same signature: <code>(x)</code>. I want to create a new function, <code>z</code>, with the same signature:</p>
  
  <pre><code>def z(x):
    return f(x) * g(x)
  </code></pre>
  
  <p>except that I'd like to be able to write</p>
  
  <p><code>z = f * g</code> instead of the above code. Is it possible?</p>