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I have Python 2.7.4 running on Fedora Rawhide and I get segmentation fault with following backtrace:
#0 0x00007f73f69ca5f1 in clear_weakref (self=0x7f73ff515c00) at Objects/weakrefobject.c:56
#1 weakref_dealloc (self=0x7f73ff515c00) at Objects/weakrefobject.c:106
#2 0x00007f73f698ea27 in PyList_SetItem (op=<optimized out>, i=<optimized out>, newitem=<optimized out>) at Objects/listobject.c:218
#3 0x00007f73f69ba9db in add_subclass (type=type@entry=0x7f73e00456b0, base=<optimized out>) at Objects/typeobject.c:4155
#4 0x00007f73f69c440e in PyType_Ready (type=type@entry=0x7f73e00456b0) at Objects/typeobject.c:4120
#5 0x00007f73f69c6d4b in type_new (metatype=<optimized out>, args=<optimized out>, kwds=<optimized out>) at Objects/typeobject.c:2467
#6 0x00007f73f69be7d3 in type_call (type=0x7f73f6cdad00 <PyType_Type>, args=0x7f73f61e1550, kwds=0x0) at Objects/typeobject.c:725
#7 0x00007f73f6954833 in PyObject_Call (func=func@entry=0x7f73f6cdad00 <PyType_Type>, arg=arg@entry=0x7f73f61e1550, kw=kw@entry=0x0) at Objects/abstract.c:2529
#8 0x00007f73f69553c9 in PyObject_CallFunctionObjArgs (callable=callable@entry=0x7f73f6cdad00 <PyType_Type>) at Objects/abstract.c:2760
#9 0x00007f73f6a06bf3 in build_class (name=<optimized out>, bases=0x7f73f61e3910, methods=0x7f73e0045590) at Python/ceval.c:4632
#10 PyEval_EvalFrameEx (f=f@entry=0x7f73e0043a40, throwflag=throwflag@entry=0) at Python/ceval.c:1928
#11 0x00007f73f6a0b46d in PyEval_EvalCodeEx (co=co@entry=0x7f73f61f50b0, globals=globals@entry=0x7f73e003bf00, locals=locals@entry=0x7f73e003bf00, args=args@entry=0x0, argcount=argcount@entry=0, 
 kws=kws@entry=0x0, kwcount=kwcount@entry=0, defs=defs@entry=0x0, defcount=defcount@entry=0, closure=closure@entry=0x0) at Python/ceval.c:3253
#12 0x00007f73f6a0b5a2 in PyEval_EvalCode (co=co@entry=0x7f73f61f50b0, globals=globals@entry=0x7f73e003bf00, locals=locals@entry=0x7f73e003bf00) at Python/ceval.c:667
#13 0x00007f73f6a22cfc in PyImport_ExecCodeModuleEx (name=name@entry=0x7f73e003d760 "warnings", co=co@entry=0x7f73f61f50b0, 
 pathname=pathname@entry=0x7f73e003ac90 "/usr/local/lib/python2.7/warnings.pyc") at Python/import.c:709
#14 0x00007f73f6a2305e in load_source_module (name=0x7f73e003d760 "warnings", pathname=0x7f73e003ac90 "/usr/local/lib/python2.7/warnings.pyc", fp=<optimized out>) at Python/import.c:1099
#15 0x00007f73f6a23f59 in import_submodule (mod=mod@entry=0x7f73f6cd2ec0 <_Py_NoneStruct>, subname=subname@entry=0x7f73e003d760 "warnings", fullname=fullname@entry=0x7f73e003d760 "warnings")
 at Python/import.c:2700
#16 0x00007f73f6a24b93 in load_next (p_buflen=<synthetic pointer>, buf=0x7f73e003d760 "warnings", p_name=<synthetic pointer>, altmod=0x7f73f6cd2ec0 <_Py_NoneStruct>, 
 mod=0x7f73f6cd2ec0 <_Py_NoneStruct>) at Python/import.c:2515
#17 import_module_level (locals=<optimized out>, level=<optimized out>, fromlist=0x7f73f6cd2ec0 <_Py_NoneStruct>, globals=<optimized out>, name=0x0) at Python/import.c:2224
#18 PyImport_ImportModuleLevel (name=0x7f73ff54fbf4 "warnings", globals=<optimized out>, locals=<optimized out>, fromlist=0x7f73f6cd2ec0 <_Py_NoneStruct>, level=<optimized out>)
 at Python/import.c:2288
#19 0x00007f73f6a033af in builtin___import__ (self=<optimized out>, args=<optimized out>, kwds=<optimized out>) at Python/bltinmodule.c:49
...
#61 0x00007f73f6a37dbc in initsite () at Python/pythonrun.c:721
#62 Py_InitializeEx (install_sigs=1) at Python/pythonrun.c:265
(full back trace is attached, it's quite long).
(gdb) py-bt
#10 Frame 0x7f4bf8043df0, for file /usr/lib64/python2.7/warnings.py, line 281, in <module> ()
 class WarningMessage(object):
#23 Frame 0x7f4bf803d300, for file /usr/lib64/python2.7/posixpath.py, line 17, in <module> ()
 import warnings
#36 Frame 0x7f4bf8024fc0, for file /usr/lib64/python2.7/os.py, line 49, in <module> ()
 import posixpath as path
#49 Frame 0x7f4bf801c520, for file /usr/lib64/python2.7/site.py, line 62, in <module> ()
 import os
I get the same crash with vanilla Python 2.7.4 without Fedora patches. Python 2.7.3 works well and doesn't crash.