From: tsuraan <tsuraan@...>
Date: 2007-04-07T02:31:52+09:00
Subject: [Painfully OT] A python question...

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So, I'm just going on the hope that the Ruby community, with its great
number of other-language enthusiasts, might have a member or two who's a
Python guru.  I asked this question about a week ago on the python list and
got all of zero responses, so I'll try here.


In python, each directory can be a library if it has a file in it called
__init__.py.  So, you can have the following directory structure:

a/__init__.py
  /b/__init__.py
    /c.py

And c.py could have some method in it, like say:

def d():
  return 'd'

And, from the python command line, you can do

>>> from a.b.c import d
>>> d()
'd'
>>>

Now, you can also put this structure in a zipfile with the same structure,
and load data from it similarly:

$ unzip -Z a.zip
Archive:  a.zip   1302 bytes   8 files
drwxr-xr-x  2.3 unx        0 bx stor  1-Apr-07 10:41 a/
drwxr-xr-x  2.3 unx        0 bx stor  1-Apr-07 10:41 a/b/
-rw-r--r--  2.3 unx       22 tx stor  1-Apr-07 10:41 a/b/c.py
-rw-r--r--  2.3 unx        0 bx stor  1-Apr-07 10:41 a/b/__init__.py
-rw-r--r--  2.3 unx       95 bx defN  1-Apr-07 10:41 a/b/__init__.pyc
-rw-r--r--  2.3 unx      186 bx defN  1-Apr-07 10:41 a/b/c.pyc
-rw-r--r--  2.3 unx        0 bx stor  1-Apr-07 10:41 a/__init__.py
-rw-r--r--  2.3 unx       93 bx defN  1-Apr-07 10:41 a/__init__.pyc
8 files, 396 bytes uncompressed, 238 bytes compressed:  39.9%
$ python
Python 2.4.3 (#1, Oct 11 2006, 23:25:18)
[GCC 4.1.1 (Gentoo 4.1.1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import sys; sys.path.insert(0, 'a.zip')
>>> import a; a
<module 'a' from 'a.zip/a/__init__.pyc'>
>>> from a.b.c import d
>>> d()
'd'

So, basically importing from a zip file looks just like importing from a
standard directory.  Now, what I can't figure out how to do is import from a
zipfile that's nested in a directory.  My layout is like this:

$ find a
a
a/__init__.py
a/__init__.pyc
a/b.zip
$ unzip -Z a/b.zip
Archive:  a/b.zip   416 bytes   3 files
drwxr-xr-x  2.3 unx        0 bx stor  6-Apr-07 12:29 b/
-rw-r--r--  2.3 unx        0 bx stor 31-Mar-07 19:58 b/__init__.py
-rw-r--r--  2.3 unx       22 tx stor  6-Apr-07 12:29 b/c.py
3 files, 22 bytes uncompressed, 22 bytes compressed:  0.0%
$ python
Python 2.4.3 (#1, Oct 11 2006, 23:25:18)
[GCC 4.1.1 (Gentoo 4.1.1)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
>>> import a.b
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
ImportError: No module named b
>>> import a
>>> dir(a)
['__builtins__', '__doc__', '__file__', '__name__', '__path__', 'b', 'here',
'mod', 'os', 'zip', 'zipimport']
>>> dir(a.b)
['__builtins__', '__doc__', '__file__', '__loader__', '__name__',
'__path__']

Does anyone here know how to import a zipfile library's contents into a
normal library?  Any Python gurus around?

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