Here's the (non-debug) trace under OS X:

Process:         Python [4604]
Path:            /Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
Identifier:      Python
Version:         ??? (???)
Code Type:       X86-64 (Native)
Parent Process:  bash [1461]

Date/Time:       2011-08-23 19:14:48.148 -0400
OS Version:      Mac OS X 10.6.8 (10K549)
Report Version:  6

Interval Since Last Report:          366485 sec
Crashes Since Last Report:           29
Per-App Crashes Since Last Report:   29
Anonymous UUID:                      5504B203-8C24-427A-B74C-EDBD3EF8DB51

Exception Type:  EXC_BAD_ACCESS (SIGSEGV)
Exception Codes: KERN_INVALID_ADDRESS at 0x0000000100569000
Crashed Thread:  0  Dispatch queue: com.apple.main-thread

Thread 0 Crashed:  Dispatch queue: com.apple.main-thread
0   pyexpat.so                    	0x000000010050e439 normal_updatePosition + 57
1   pyexpat.so                    	0x00000001004f9314 PyExpat_XML_GetCurrentLineNumber + 84
2   pyexpat.so                    	0x00000001004f374e set_error + 62
3   pyexpat.so                    	0x00000001004f4588 xmlparse_Parse + 200
4   org.python.python             	0x00000001000c102d PyEval_EvalFrameEx + 22397
5   org.python.python             	0x00000001000c2d29 PyEval_EvalCodeEx + 2137
6   org.python.python             	0x00000001000c0b6a PyEval_EvalFrameEx + 21178
7   org.python.python             	0x00000001000c2d29 PyEval_EvalCodeEx + 2137
8   org.python.python             	0x00000001000c2e46 PyEval_EvalCode + 54
9   org.python.python             	0x00000001000e7b6e PyRun_FileExFlags + 174
10  org.python.python             	0x00000001000e7e29 PyRun_SimpleFileExFlags + 489
11  org.python.python             	0x00000001000fe77c Py_Main + 2940
12  org.python.python             	0x0000000100000f14 0x100000000 + 3860

Thread 0 crashed with X86 Thread State (64-bit):
  rax: 0x00000000fffffffb  rbx: 0x000000010037bbc0  rcx: 0x000000010037bec8  rdx: 0x00000001008cd39f
  rdi: 0x00000001005256c0  rsi: 0x0000000100569000  rbp: 0x00007fff5fbfedf0  rsp: 0x00007fff5fbfedf0
   r8: 0x000000010050e458   r9: 0x00000001008caa00  r10: 0x0000000000000800  r11: 0x0000000100542dda
  r12: 0x0000000000000000  r13: 0x00000001003037e0  r14: 0x0000000000000009  r15: 0x00000001004aca70
  rip: 0x000000010050e439  rfl: 0x0000000000010293  cr2: 0x0000000100569000

Binary Images:
       0x100000000 -        0x100000fff +org.python.python 2.7.2 (2.7.2) <639E72E4-F205-C034-8E34-E59DE9C46369> /Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/Contents/MacOS/Python
       0x100003000 -        0x10016cfef +org.python.python 2.7.2, (c) 2004-2011 Python Software Foundation. (2.7.2) <49D18B1A-C92D-E32E-A7C1-086D0B14BD76> /Library/Frameworks/Python.framework/Versions/2.7/Python
       0x1002ec000 -        0x1002efff7 +strop.so ??? (???) <F7857283-F427-7CF7-9B0D-7619AA0A82F1> /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/strop.so
       0x1004f0000 -        0x100524fe7 +pyexpat.so ??? (???) <E5FD4237-8D59-8B8E-E229-19601A03F18E> /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-dynload/pyexpat.so
    0x7fff5fc00000 -     0x7fff5fc3bdef  dyld 132.1 (???) <B536F2F1-9DF1-3B6C-1C2C-9075EA219A06> /usr/lib/dyld
    0x7fff8005d000 -     0x7fff801d4fe7  com.apple.CoreFoundation 6.6.5 (550.43) <31A1C118-AD96-0A11-8BDF-BD55B9940EDC> /System/Library/Frameworks/CoreFoundation.framework/Versions/A/CoreFoundation
    0x7fff822f0000 -     0x7fff824b1fef  libSystem.B.dylib 125.2.11 (compatibility 1.0.0) <9AB4F1D1-89DC-0E8A-DC8E-A4FE4D69DB69> /usr/lib/libSystem.B.dylib
    0x7fff82781000 -     0x7fff82792ff7  libz.1.dylib 1.2.3 (compatibility 1.0.0) <FB5EE53A-0534-0FFA-B2ED-486609433717> /usr/lib/libz.1.dylib
    0x7fff8376d000 -     0x7fff837eafef  libstdc++.6.dylib 7.9.0 (compatibility 7.0.0) <35ECA411-2C08-FD7D-11B1-1B7A04921A5C> /usr/lib/libstdc++.6.dylib
    0x7fff85577000 -     0x7fff8557bff7  libmathCommon.A.dylib 315.0.0 (compatibility 1.0.0) <95718673-FEEE-B6ED-B127-BCDBDB60D4E5> /usr/lib/system/libmathCommon.A.dylib
    0x7fff86259000 -     0x7fff86417fff  libicucore.A.dylib 40.0.0 (compatibility 1.0.0) <4274FC73-A257-3A56-4293-5968F3428854> /usr/lib/libicucore.A.dylib
    0x7fff86526000 -     0x7fff865dcff7  libobjc.A.dylib 227.0.0 (compatibility 1.0.0) <03140531-3B2D-1EBA-DA7F-E12CC8F63969> /usr/lib/libobjc.A.dylib
    0x7fff8739a000 -     0x7fff873e6fff  libauto.dylib ??? (???) <F7221B46-DC4F-3153-CE61-7F52C8C293CF> /usr/lib/libauto.dylib
    0x7fffffe00000 -     0x7fffffe01fff  libSystem.B.dylib ??? (???) <9AB4F1D1-89DC-0E8A-DC8E-A4FE4D69DB69> /usr/lib/libSystem.B.dylib