Possible Duplicate:
Do comments slow down an interpreted language?
Will there be noticeable performance degradation in the execution of a large .py file if more than 75% of the lines of code are properly commented?
Will excessive commenting of code slow execution?
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No
When you run python, the first step is to convert to bytecode, which is what those
.pycfiles are. Comments are removed from these, so it won't matter*.If you run with the
-Oor-OOoption, python will produce "optimized"pyofiles, which are negligibly faster, if faster at all. The main difference is that:-Oassertion are removed,-OOoption, the__doc__strings are stripped out. Given that those are sometimes needed, running with-OOisn't recommended.* it's been pointed out below that
.pycfiles are only saved for modules. Thus the top-level executable must be recompiled every time it's run. This step could slow down a massive python executable. In practice, most of the code should reside in modules, making this a non-issue.