Python LOC, .exe size, and refactoring
cmpython at gmail.com
Fri Feb 24 13:44:12 EST 2012
On Feb 22, 12:29 am, Steven D'Aprano <steve
+comp.lang.pyt... at pearwood.info> wrote:
> On Tue, 21 Feb 2012 19:51:07 -0800, CM wrote:
> > I have an application that I was hoping to reduce a bit the size of its
> > .exe when "packaged" with py2exe. I'm removing some Python modules such
> > as Tkinter, etc., but now wonder how much I could size I could reduce by
> > refactoring--and therefore shortening--my code.
> Well that will depend on how much you refactor it, but frankly, unless
> your code is truly awful, this will be a micro-optimization. py2exe
> bundles a Python runtime environment plus your files into a single exe
> file. Typically the runtime environment will be somewhere around 11MB for
> wxPython GUI apps (or 4MB with compression turned on, which will slow
> your application down).
> The runtime environment for Oracle's Java environment starts at 7MB and
> is typically 15MB, plus whatever libraries your own code produces. For
> dot-net applications, the framework can be up to 60MB.
> While I think 60MB for a basic calculator app is taking the piss, this is
> 2011 not 1987 and we don't have to support floppy disks any more. 11MB
> for a GUI app is nothing to be worried about. That takes, what, 3 minutes
> to download even on a 512 kbps link?
> > Is there a rule of thumb that predicts the relationship between the
> > number of lines of Python code and the resultant size of the application
> > (leaving aside the size of imported modules)?
> Yes. To a close approximation, for most applications:
> size of bundled application = (
> size of Python runtime environment + size of libraries used
> Your code is most likely insignificant compared to the others.
> > Or is there a way to
> > roughly estimate how much would refactoring the code as much as I
> > reasonably can help? (For example, in some cases there is some cut and
> > paste coding...I know, it's bad).
> Look at it this way: take the .pyc file from your code. How big is it?
> Say, it's 200K. That's a BIG file -- the decimal module in the standard
> library is only 152K. Suppose you could cut it in half -- you would save
> 100K. Even if you could somehow cut it down to 1K, you've saved less than
> 200K. Do you care?
> Refactoring your code is double-plus good for maintainability. You should
> do it anyway. But don't do it to shrink an 11MB exe down to 10.8MB.
Thanks. All helpful advice. I'm coming in around 14 MB when you
count some libraries, image files, etc., and I think I can live with
that, considering I was able to reduce it from about 20 MB at one
point by some excluding.
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