Get n-th bit precision of integer
<p>I am given a large integer <code>a</code>, and a (relatively small) integer <code>n</code>.</p>

<p>What is the fastest way to get the <code>n</code>th bit (from the right) of the binary decomposition of <code>a</code> using Python? (I do not want to write a C pluggin, just plain Python.)</p>
