[Python-Dev] New and Improved Import Hooks

[Moore, Paul]

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From: Just van Rossum [mailto:just@letterror.com]
> I think this is more or less the same as iu.py,
> except that there's no need for a "shadowpath"

Thinking further, what is the advantage of your code
over iu.py, if this is true? Performance? Do you have
figures?

Paul.

PS I attach a small test script I used to get a feel
   for the performance of Jim's patch. Unzip this file,
   then do
       cd test
       zip -0r ../test0 *
       zip -9r ../test9 *
   Create a copy of the standard library as Lib, and do
       cd Lib
       zip -0r ../stdlib0 *
       zip -9r ../stdlib9 *
   Then run test.py.

   Figures for me, with CVS + Jim's patch, on a 450MHz
   Athlon with 256M RAM running Windows 2000, were:

       Lib [[['Lib\\email']]]:    0.309
       stdlib0.zip [[['stdlib0.zip\\email']]]:    0.866
       stdlib9.zip [[['stdlib9.zip\\email']]]:    1.154
       test [[test\testCR.pyc]]:    0.344
       test0.zip [[test0.zip\testCR.py]]:    0.204
       test9.zip [[test9.zip\testCR.py]]:    0.348

   So import from zip is noticeably slower than directory
   imports on big zips, but *faster* on small ones.
   Compressed zipfiles are slower than uncompressed.

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