On Fri, Jul 24, 2015 at 3:54 PM, candide <c.cand...@laposte.net> wrote:
> Of course, computing 42**1000000 is not free:
> So please, explain the following:
>
> (focus on the CPU TIME!!)
In your second example, the peephole optimizer gets hold of it and
does the calculation at compile time:
Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 23 2015, 02:52:03)
[GCC 4.2.1 (Apple Inc. build 5666) (dot 3)] on darwin
Type "help", "copyright", "credits" or "license" for more information.
>>> from dis import dis
>>> def with_var(): N = 100; return 42**N
...
>>> def no_var(): return 42**100
...
>>> dis(with_var)
1 0 LOAD_CONST 1 (100)
3 STORE_FAST 0 (N)
6 LOAD_CONST 2 (42)
9 LOAD_FAST 0 (N)
12 BINARY_POWER
13 RETURN_VALUE
>>> dis(no_var)
1 0 LOAD_CONST 3
(2113143741011360736530044045523113991698878330713580061264477934391564919875497777688215057732151811172029315247932158994879668553186145824710950394684126712037376)
3 RETURN_VALUE
>>>
--
Zach
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