[BangPypers] Tuples vs Lists, perfromance difference

Vishal vsapre80 at gmail.com
Wed Jan 13 10:21:54 CET 2010


>
>
> Here is more real example.
>
> >>> def square(x): y = x*x; return y
> ...
> >>> import dis
> >>> dis.dis(square)
>  1           0 LOAD_FAST                0 (x)
>              3 LOAD_FAST                0 (x)
>              6 BINARY_MULTIPLY
>              7 STORE_FAST               1 (y)
>             10 LOAD_FAST                1 (y)
>             13 RETURN_VALUE
>
> As you see the interpreter is pretty stupid. It is loading x twice and
> unnecessarily storing and loading y.
>
> Anand
> _______________________________________________
>  <http://mail.python.org/mailman/listinfo/bangpypers>
>

Is interpreter too stupid or is the python compiler that creates the
bytecoded file, too simple and ignoring optimizations on the bytecode it
creates. I think its the later? please correct me

-- 
Thanks and best regards,
Vishal Sapre

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