[Python-Dev] Caching float(0.0) (original) (raw)

Steve Holden steve at holdenweb.com
Sat Sep 30 09:45:03 CEST 2006

Jason Orendorff wrote:

On 9/29/06, Fredrik Lundh <fredrik at pythonware.com> wrote:

(I just checked the program I'm working on, and my analysis tells me that the most common floating point value in that program is 121.216, which occurs 32 times. from what I can tell, 0.0 isn't used at all.) bemused look Fredrik, can you share the reason why this number occurs 32 times in this program? I don't mean to imply anything by that; it just sounds like it might be a fun story. :) Anyway, this kind of static analysis is probably more entertaining than relevant. For your enjoyment, the most-used float literals in python25\Lib, omitting test directories, are: 1e-006: 5 hits 4.0: 6 hits 0.05: 7 hits 6.0: 8 hits 0.5: 13 hits 2.0: 25 hits 0.0: 36 hits 1.0: 62 hits There are two hits each for -1.0 and -0.5. In my own Python code, I don't even have enough float literals to bother with. By these statistics I think the answer to the original question is clearly "no" in the general case.

regards Steve

Steve Holden +44 150 684 7255 +1 800 494 3119 Holden Web LLC/Ltd http://www.holdenweb.com Skype: holdenweb http://holdenweb.blogspot.com Recent Ramblings http://del.icio.us/steve.holden

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