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Showing content from https://mail.python.org/pipermail/python-dev/2002-December/030848.html below:

[Python-Dev] New and Improved Import Hooks

[Python-Dev] New and Improved Import HooksWiktor Sadowski Wiktor Sadowski" <art@wiktorsadowski.com
Thu, 5 Dec 2002 00:24:31 +0100 
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>Should be "importing_module_from_dlls".

>I still don't understand. Is that some feature of Python?

Under Windows you can put a Module.pyd into Python/DLLs directory and:
import Module

>>If you mean "one .pyd file is one Python module", then this approach
>>won't work for .zip files:People want many .py modules in a single
.zip
>>file.

>It will work if handled by the zip importer.

>How will the zip importer know what zipfile to read?

>If I have "python23.zip", and do

>import httplib

>what mechanism will extract httplib.py from python23.zip?

As I said: a virtual directory-tree could be built for all zip files in=20
ARCHIVES directory:

ZipArchives:
   ZipArchives/python23.zip:
                ZipArchives/python23.zip/Lib:
                    ZipArchives/python23.zip/Lib/httplib.pyc
   ZipArchives/another.zip:=20
               ZipArchives/another.zip/another_directory:
                       =
ZipArchives/another.zip/another_directory/another_module.pyc     =20

> from MyArchive_with_many_modules import MyModule

>So you could only zip entire packages?=20
No.
"from MyArchive import MyModule"
would be resolved by zip importer as:
if there is MyModule in MyArchive.zip then then import MyModule
(means extract and import)

and
import Module:
if Module.zip contains Module import Module

Wiktor


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<DIV>&gt;Should be "importing_module_from_dlls".<BR><BR>&gt;I still =
don't=20
understand. Is that some feature of Python?</DIV>
<DIV><FONT face=3DArial size=3D2></FONT>&nbsp;</DIV>
<DIV>Under Windows you can put a Module.pyd into Python/DLLs directory=20
and:</DIV>
<DIV><FONT face=3DArial size=3D2><FONT face=3D"Times New Roman" =
size=3D3>import=20
Module</FONT></DIV>
<DIV><BR><FONT face=3D"Times New Roman" size=3D3>&gt;&gt;If you mean =
"one .pyd file=20
is one Python module", then this approach<BR>&gt;&gt;won't work for .zip =

files:People want many .py modules in a=20
single<BR>.zip<BR>&gt;&gt;file.<BR><BR>&gt;It will work if handled by =
the zip=20
importer.<BR><BR>&gt;How will the zip importer know what zipfile to=20
read?<BR><BR>&gt;If I have "python23.zip", and do<BR><BR>&gt;import=20
httplib<BR><BR>&gt;what mechanism will extract httplib.py from=20
python23.zip?</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>As I said:&nbsp;a virtual=20
directory-tree could be built for all zip files in </FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>ARCHIVES =
directory:</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>ZipArchives:</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>&nbsp;&nbsp;=20
ZipArchives/python23.zip:</FONT></DIV>
<DIV><FONT face=3D"Times New Roman"=20
size=3D3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;=20
ZipArchives/python23.zip/Lib:</FONT></DIV>
<DIV><FONT face=3D"Times New Roman"=20
size=3D3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
ZipArchives/python23.zip/Lib/httplib.pyc</FONT></DIV>
<DIV><FONT face=3D"Times New Roman"=20
size=3D3>&nbsp;&nbsp;&nbsp;ZipArchives/another.zip:&nbsp;</FONT></DIV>
<DIV><FONT face=3D"Times New Roman"=20
size=3D3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;=20
ZipArchives/another.zip/another_directory:</FONT></DIV>
<DIV><FONT face=3D"Times New Roman"=20
size=3D3>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbs=
p;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;=20
ZipArchives/another.zip/another_directory/another_module.pyc&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;=20
</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>&gt; from =
MyArchive_with_many_modules=20
import MyModule<BR><BR>&gt;So you could only zip entire packages? =
</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>No.</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>"from MyArchive import=20
MyModule"</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>would be resolved by zip =
importer=20
as:</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>if there is MyModule in =
MyArchive.zip=20
then then import MyModule</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>(means extract and =
import)</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>and</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>import Module:</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3>if Module.zip contains =
Module import=20
Module</FONT></DIV>
<DIV><FONT face=3D"Times New Roman" size=3D3></FONT>&nbsp;</DIV>
<DIV><FONT face=3D"Times New Roman"=20
size=3D3>Wiktor</FONT><BR></DIV></FONT></BODY></HTML>

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