[Pythonmac-SIG] xcode problems

[Ronald Oussoren]

On Oct 19, 2006, at 4:27 AM, Muhammad Alkarouri wrote:

> Hi everyone,
>
> I am a newbie in the Mac world, having bought my first Mac Mini a  
> couple of
> days ago. I promptly went on to find out about Python programming  
> there.
>
> I installed Python 2.5 from python.org, so I have it besides 2.3. I  
> also
> installed xcode 2.4. That is on OS X 10.4.8. Then I tried to follow  
> "Using
> PyObjC for Developing Cocoa Applications with Python". Here is  
> where small
> problems crop up. I would like to know the right solution about  
> (some of) these
> problems.
>
> - Using xcode I followed the tutorial. I wasn't able to build. I  
> get build
> failed with No module named py2app. I understand this comes with  
> PyObjC so I
> tried to install that again. The installer for PyObjC 1.3.7 from
> http://prdownloads.sourceforge.net/pyobjc/pyobjc-1.3.7-py2.3- 
> macosx10.4.zip?download
> gives me an error on import along the lines of unable to import due  
> to "mach-o,
> but wrong architecture". I tried PyObjC 1.4 from source but it  
> wasn't able to
> install due to a permission error. I didn't try to investigate  
> that, especially
> as there is no binary for python 2.3 so I figured that something  
> was amiss.
> Anyway, I tried to use Python 2.5.

There currently is no proper binary installer for PyObjC. I hope to  
have some time soon to work on that, but don't hold your breath.

>
> - To use Python 2.5 I installed PyObjC 1.4. The installation went  
> smoothly. I
> had to modify setup.py to use /usr/local/bin/python following a  
> hint somewhere
> the internet. Now "Build and Go" wasn't working (why?). Following  
> another hint
> I mad a custom executable like "/usr/bin/env
> PyAverager.app/Contents/MacOS/PyAverager". This is now working.

I'd drop Xcode unless you already know it, Xcode can be used as a  
python editor but is really heavy-weight for what it offers to Python  
programmers (it's great for ObjC programming, but most of Xcode is  
closed for Python programmers).

>
> - The next problem is in the code itself. When trying to run the  
> application
> PyAverager I get an error:
> PyAverager[3377] Unknown class `Averager' in nib file, using  
> `NSObject' instead

Where did you find this example? It isn't part of the PyObjC  
distribution, so I can't help you here without further information.

> ...
> NSUnknownKeyException - [<NSObject 0x1427590>  
> valueForUndefinedKey:]: this
> class is not key value coding-compliant for the key numbersInput
>
> So the nib (whatever that is) cannot find the class Averager.

A nib file is the output format of Interface Builder, which is the  
GUI designer for OSX.  It is basically a pickled object graph for a GUI.
>
> So the important questions for me now are:
> - Is there anyway to automate the change of setup.py to use
> /usr/local/bin/python at each new project, rather than doing it  
> manually?

The 2.4.3, 2.4.4 and 2.5 installers for python should ensure that the  
right directory (which isn't /usr/local/bin b.t.w.) is on $PATH. What  
is your shell environment? I assume you use the default shell (bash),  
do you have any custom startup files  
(.profile, .bashrc, .bash_login, ...)?

> - Shouldn't "Build and Go" be working automatically? Or is there  
> anyway to
> automate the creation of the custom executable for each new python  
> project?

It would be nice if that button worked, but I don't have time to fix  
this. Making changes to the xcode templates is no fun, even if you do  
know how to do so  which I don't.

PyObjC is a bit in flux at the moment, we've transitioned to  
setuptools but never got around to completely finishing that  
transition, which explains the lack of binary installers.

Ronald

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