| python Programming Glossary: dilPython performance: Try-except or not in? http://stackoverflow.com/questions/3111195/python-performance-try-except-or-not-in  tradeoff depends on the of missing keys. So consider a dil.py file as follows def make percentmissing global d d dict.fromkeys.. a series of timeit calls such as python mtimeit s'import dil dil.make 10 ' 'dil.with_in ' 10000 loops best of 3 28 usec per.. series of timeit calls such as python mtimeit s'import dil dil.make 10 ' 'dil.with_in ' 10000 loops best of 3 28 usec per loop.. 
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