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By dotCore
via doughellmann.com
Published: Nov 15 2012 / 10:19

The Performance Impact of Using dict() Instead of {} in CPython 2.7
With CPython 2.7, using dict() to create dictionaries takes up to 6 times longer and involves more memory allocation operations than the literal syntax. Use {} to create dictionaries, especially if you are pre-populating them, unless the literal syntax does not work for your case.
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