And-ing , OR-ing for Sets in python
<p>So I have </p>

<pre><code>a=set(["a"])
b=set(["b"])
</code></pre>

<p><code>c=a&amp;b</code> would return a empty set, <code>c=set([])</code>
But when i type <code>c = a and b</code>, why does it give me a <code>set(["b"])</code></p>

<p>What is the "<code>and</code>" and "<code>or</code>" doing when used in two sets?</p>
