I am trying to rebuild the 2.7 maintenance branch and get this error
on Ubuntu 10.04.1 LTS:

XXX lineno: 743, opcode: 0
Traceback (most recent call last):
 File "/usr/local/src/python-2.7-maint-svn/Lib/site.py", line 62, in <module>
  import os
 File "/usr/local/src/python-2.7-maint-svn/Lib/os.py", line 743, in <module>
  def urandom(n):
SystemError: unknown opcode

I installed it successfully once so I may be getting conflicts, but I can't figure out why.  There were some similar bugs reported in previous versions but I didn't see a clear solution.

I have done "make distclean" and "./configure".  I have unset my
PYTHONPATH and LD_LIBRARY_PATH, but python2.7 is my default python from a previous good build and installation.