I always ignored this test error, but maybe you want to
fix this:

test test_nis crashed -- nis.error: no such key in map


$ ./python Lib/test/test_nis.py
nis.maps()
group.bygid.tmp
mail.aliases
      
     n.strack strack
Traceback (most recent call last):
  File "Lib/test/test_nis.py", line 24, in ?
    if nis.match(k, nismap) != v:
nis.error: no such key in map
$

I believe this might be some misconfiguration of NIS on
thsi host(we use it on other machines, but it should
not be enabled on this particular machine). 

But, when I do "ypcat mail.aliases", I do not see a
line with "n.strack strack". Maybe more debug trace
would help to find what's going on.