[Pythonmac-SIG] Py2App 0.1.7

[Chris Barker]

Hi all (but particularly Bob)

I just installed Py2App with the installer, but when I tried to use it I 
got:

Traceback (most recent call last):
   File "setup.py", line 21, in ?
     import py2app
   File "/purelib/py2app/py2app/__init__.py", line 33, in ?
   File "/purelib/py2app/py2app/install.py", line 15, in ?
   File "/purelib/py2app/py2app/command/__init__.py", line 1, in ?
   File "/purelib/py2app/py2app/build_app.py", line 20, in ?
   File "/purelib/py2app/modulegraph/find_modules.py", line 21, in ?
   File "/purelib/py2app/modulegraph/modulegraph.py", line 15, in ?
ImportError: No module named ObjectGraph


My first question was:

"where the heck is /purelib ?"

After some poking around, I found that indeed, there is no module 
objectgraph in:

/Library/Python/2.3/altgraph/

which is version "0.6.1"

but there is one in:

/Library/Python/2.3/py2app/altgraph

which is version "0.6.3"

As I'd never heard of altgraph before, I'm guessing that the older 
version was installed by a previous version of Py2App, and Py2app now 
puts it in a different place, and the older one is being found first. To 
test this, I removed the older one, and then got:

Traceback (most recent call last):
   File "./setup.py", line 10, in ?
     import py2app
   File "/purelib/py2app/py2app/__init__.py", line 33, in ?
   File "/purelib/py2app/py2app/install.py", line 15, in ?
   File "/purelib/py2app/py2app/command/__init__.py", line 1, in ?
   File "/purelib/py2app/py2app/build_app.py", line 25, in ?
ImportError: No module named MachOGraph

So I then deleted everything outside of /Users that had py2app in it. 
Then re-installed py2app. Running it again, I got the same error:

ImportError: No module named MachOGraph

Looking in the source, I see that MachOGraph.py is in src/macholib, but 
in my python installation macholib is in both

/Library/Python/2.3/
and
/Library/Python/2.3/py2app/

just like altgraph.

lather, rinse repeat, and BINGO! it works.

So, am I right that those older versions of altgraph and macholib were 
installed by an older Py2app?

If so, some sort of waring should be put in about that.

Also, while it's probably a good idea that you're now putting those 
packages inside the Py2app directory, it would probably be better to 
load them as:

from Py2app.macholib import MachOGraph

So that you know you're getting the version you installed for Py2app.

By the way, if I needed altgraph for something else, I'd now be kind of 
screwed. Tome, this supports the argument I've been making for 
versioning. If we had a standard approach for versioning python 
packages, you could have the Py2app installer install the version of 
altgraph (and whatever else) it needs, and not screw up an exiting 
installation that other folk's code might be depending on.

-Chris

PS: Now that it works, it works fabulously! My simple wxPython app built 
with the very simplest of setup.py files, except for wxversion, which 
I'm going to go read Bob's changes in the Wiki, and figure out how to do 
that. Nice job.


-- 
Christopher Barker, Ph.D.
Oceanographer
                                     		
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Chris.Barker at noaa.gov