Python: Best Way to Exchange Keys with Values in a Dictionary?
http://stackoverflow.com/questions/1031851/python-best-way-to-exchange-keys-with-values-in-a-dictionary
answer is:
<code><span class="pln">res </span><span class="pun">=</span><span class="pln"> dict</span><span class="pun">((</span><span class="pln">v</span><span class="pun">,</span><span class="pln">k</span><span class="pun">)</span><span class="pln"> </span><span class="kwd">for</span><span class="pln"> k</span><span class="pun">,</span><span class="pln">v </span><span class="kwd">in</span><span class="pln"> a</span><span class="pun">.</span><span class="pln">iteritems</span><span class="pun">())</span><span class="pln"> </span></code>
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