Tormented by python warning/errors

[Harry Putnam <reader@xxxxxxxxxxx>]

After a semi-extensive update off of Fedora rawhide home repo, I'm
getting python errors if I run yum or up2date:

# yum list updates
  Traceback (most recent call last):
    File "/usr/bin/yum", line 6, in ?
      import yummain
    File "/usr/share/yum-cli/yummain.py", line 23, in ?
      import yum
    File "/usr/lib/python2.4/site-packages/yum/__init__.py", line 21, in ?
      import rpm
  ImportError: /usr/lib/librpm-4.3.so: undefined symbol: rpm_execcon

I didn't really keep track of what was getting updated but it was a
number of fairly basic packages, including rpm and yum.  Glibc was
also amongst them.