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doctest.DocTestParser._EXCEPTION_RE does not allow for output before the
actual traceback.
Attached is a simple test that demonstrates the problem. This patch
fixes it:
--- /usr/lib/python2.5/doctest.py 2007年10月22日 21:45:21.000000000 +0200
+++ /home/daniel/tmp/doctest.py 2007年10月22日 22:19:12.000000000 +0200
@@ -513,7 +513,7 @@
 _EXCEPTION_RE = re.compile(r"""
 # Grab the traceback header. Different versions of Python have
 # said different things on the first traceback line.
- ^(?P<hdr> Traceback\ \(
+ .*^(?P<hdr> Traceback\ \(
 (?: most\ recent\ call\ last
 | innermost\ last
 ) \) :
 _EXCEPTION_RE = re.compile(r"""
 # Grab the traceback header. Different versions of Python have
 # said different things on the first traceback line.
 ^(?P<hdr> Traceback\ \(
 (?: most\ recent\ call\ last
 | innermost\ last
 ) \) :
 )
 \s* $ # toss trailing whitespace on the header.
 (?P<stack> .*?) # don't blink: absorb stuff until...
 ^ (?P<msg> \w+ .*) # a line *starts* with alphanum.
 """, re.VERBOSE | re.MULTILINE | re.DOTALL)

The existing tests include a test explicitly for the existing behavior,
including the statement: "An example may not generate output before it
raises an exception". In order to be able to accept this change, there
is going to have to be discussion in python-dev or here about changing
the behavior.