i trying to compile Python 2.6.1 from scratch on Mac OS X Server (ppc).
After configure/make/make install i test the compiled python with
the followig file (t.py) (example from
http://docs.python.org/library/urllib.html):


Contents of /tmp/t.py:
-------------
import urllib
params = urllib.urlencode({'spam': 1, 'eggs': 2, 'bacon': 0})
f = urllib.urlopen("http://www.musi-cal.com/cgi-bin/query", params)
print f.read()
-------------

and i get this error:

python /tmp/t.py 
Traceback (most recent call last):
  File "/tmp/t.py", line 3, in <module>
    f = urllib.urlopen("http://www.musi-cal.com/cgi-bin/query", params)
  File "/usr/local/test/python/lib/python2.6/urllib.py", line 82, in urlopen
    opener = FancyURLopener()
  File "/usr/local/test/python/lib/python2.6/urllib.py", line 611, in
__init__
    URLopener.__init__(self, *args, **kwargs)
  File "/usr/local/test/python/lib/python2.6/urllib.py", line 129, in
__init__
    proxies = getproxies()
  File "/usr/local/test/python/lib/python2.6/urllib.py", line 1555, in
getproxies
    return getproxies_environment() or getproxies_macosx_sysconf()
  File "/usr/local/test/python/lib/python2.6/urllib.py", line 1449, in
getproxies_macosx_sysconf
    _CFSetup(sc)
  File "/usr/local/test/python/lib/python2.6/urllib.py", line 1330, in
_CFSetup
    sc.CFStringCreateWithCString.argtypes = [ c_void_p, c_char_p, c_int32 ]
  File "/usr/local/test/python/lib/python2.6/ctypes/__init__.py", line
366, in __getattr__
    func = self.__getitem__(name)
  File "/usr/local/test/python/lib/python2.6/ctypes/__init__.py", line
371, in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: dlsym(RTLD_DEFAULT, CFStringCreateWithCString): symbol
not found
Exception AttributeError: "FancyURLopener instance has no attribute
'tempcache'" in <bound method FancyURLopener.__del__ of
<urllib.FancyURLopener instance at 0x3743a0>> ignored


than tested it whit this code (Thanks to Ned Deily)
See the mailinglist thread at:
http://mail.python.org/pipermail/python-list/2009-March/703067.html

Contents of /tmp/tt.py:
-----------------------
from ctypes import cdll
from ctypes.util import find_library
sc = cdll.LoadLibrary(find_library("SystemConfiguration"))
x = sc.CFStringCreateWithCString(0, "HTTPEnable", 0)
-----------------------
/usr/local/test/python/bin/python2.6 /tmp/tt.py
Traceback (most recent call last):
  File "/tmp/tt.py", line 4, in <module>
    x = sc.CFStringCreateWithCString(0, "HTTPEnable", 0)
  File "/usr/local/test/python/lib/python2.6/ctypes/__init__.py", line
366,
in __getattr__
    func = self.__getitem__(name)
  File "/usr/local/test/python/lib/python2.6/ctypes/__init__.py", line
371,
in __getitem__
    func = self._FuncPtr((name_or_ordinal, self))
AttributeError: dlsym(RTLD_DEFAULT, CFStringCreateWithCString): symbol
not
found

Both test fails on my PPC Mac and runs without error on my Intel MacBook

Some detailed info about the macs:

ppc:
Model Name: Xserve G5
Model Identifier: RackMac3,1
Processor Name: PowerPC G5  (3.1)
Processor Speed: 2.3 GHz
Number Of CPUs: 2
L2 Cache (per CPU): 512 KB
Boot ROM Version: 5.1.7f2
System Version: Mac OS X Server 10.5.6 (9G55)
Kernel Version: Darwin 9.6.0


intel:
Model Name: MacBook Pro
Model Identifier: MacBookPro3,1
Processor Name: Intel Core 2 Duo
Processor Speed: 2.4 GHz
Number Of Processors: 1
Total Number Of Cores: 2
L2 Cache: 4 MB
Bus Speed: 800 MHz
Boot ROM Version: MBP31.0070.B07
SSC Version: 1.16f8
System Version: Mac OS X 10.5.6 (9G55)
Kernel Version: Darwin 9.6.0


I recompiled Python-2.6.1 with MACOSX_DEPLOYMENT_TARGET=10.3, but no
change..
I updated developertools to xcode312_2621, no change..

Btw.. Python-2.5.4 compiled from scratch works fine.

I dig a bit deeper with otool and discover some differences:

Intel MacOS.so: Carbon, libSystem.B.dylib, CoreServices,
ApplicationServices

PPC MacOS.so: Carbon, libmx.A.dylib, libSystem.B.dylib

Intel _ctypes.so: libSystem.B.dylib
PPC _ctypes.so: libmx.A.dylib, libSystem.B.dylib

-----------
Intel with deploymant target 10.3, xcode312:
-----------
sh-3.2# otool
-L /usr/local/test/python/lib/python2.6/lib-dynload/MacOS.so
/usr/local/test/python/lib/python2.6/lib-dynload/MacOS.so:
    /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
(compatibility version 2.0.0, current version 136.0.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
version
111.1.3)
    
/System/Library/Frameworks/CoreServices.framework/Versions/A/CoreServices
(compatibility version 1.0.0, current version 32.0.0)
    
/System/Library/Frameworks/ApplicationServices.framework/Versions/A/Applicat
ionServices (compatibility version 1.0.0, current version 34.0.0)

-------

sh-3.2# otool
-L /usr/local/test/python/lib/python2.6/lib-dynload/_ctypes.so
/usr/local/test/python/lib/python2.6/lib-dynload/_ctypes.so:
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
version
111.1.3)

----------
PPC with deployment_target 10.3, xcode312_2621
----------

otool -L /usr/local/test/python/lib/python2.6/lib-dynload/MacOS.so
/usr/local/test/python/lib/python2.6/lib-dynload/MacOS.so:
    /System/Library/Frameworks/Carbon.framework/Versions/A/Carbon
(compatibility version 2.0.0, current version 136.0.0)
    /usr/lib/libmx.A.dylib (compatibility version 1.0.0, current version
47.1.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
version
111.1.3)

-------


otool -L /usr/local/test/python/lib/python2.6/lib-dynload/_ctypes.so
/usr/local/test/python/lib/python2.6/lib-dynload/_ctypes.so:
    /usr/lib/libmx.A.dylib (compatibility version 1.0.0, current version
47.1.0)
    /usr/lib/libSystem.B.dylib (compatibility version 1.0.0, current
version
111.1.3)


How i compiled it:

export MACOSX_DEPLOYMENT_TARGET=10.5
configure --prefix=/usr/local/test/python
make
make install

How i test:

export
PYTHONPATH=/usr/local/test/python:/usr/local/test/python/lib/python2.6/site-packages
/usr/local/test/python/bin/ is in the PATH
python /tmp/t.py