[Python-checkins] cpython: Issue #19138: doctest's IGNORE_EXCEPTION_DETAIL now allows no detail at all.

Wed Dec 4 04:02:19 CET 2013

http://hg.python.org/cpython/rev/c80083ad142d
changeset: 87750:c80083ad142d
user: Tim Peters <tim at python.org>
date: Tue Dec 03 21:02:05 2013 -0600
summary:
 Issue #19138: doctest's IGNORE_EXCEPTION_DETAIL now allows no detail at all.
files:
 Lib/doctest.py | 33 ++++++++++++++++++++++++---
 Lib/test/test_doctest.py | 27 ++++++++++++++++++++++
 Misc/NEWS | 4 +++
 3 files changed, 60 insertions(+), 4 deletions(-)

diff --git a/Lib/doctest.py b/Lib/doctest.py
--- a/Lib/doctest.py
+++ b/Lib/doctest.py
@@ -318,6 +318,32 @@
 else:
 return '#'
 
+def _strip_exception_details(msg):
+ # Support for IGNORE_EXCEPTION_DETAIL.
+ # Get rid of everything except the exception name; in particular, drop
+ # the possibly dotted module path (if any) and the exception message (if
+ # any). We assume that a colon is never part of a dotted name, or of an
+ # exception name.
+ # E.g., given
+ # "foo.bar.MyError: la di da"
+ # return "MyError"
+ # Or for "abc.def" or "abc.def:\n" return "def".
+
+ start, end = 0, len(msg)
+ # The exception name must appear on the first line.
+ i = msg.find("\n")
+ if i >= 0:
+ end = i
+ # retain up to the first colon (if any)
+ i = msg.find(':', 0, end)
+ if i >= 0:
+ end = i
+ # retain just the exception name
+ i = msg.rfind('.', 0, end)
+ if i >= 0:
+ start = i+1
+ return msg[start: end]
+
 class _OutputRedirectingPdb(pdb.Pdb):
 """
 A specialized version of the python debugger that redirects stdout
@@ -1325,10 +1351,9 @@
 
 # Another chance if they didn't care about the detail.
 elif self.optionflags & IGNORE_EXCEPTION_DETAIL:
- m1 = re.match(r'(?:[^:]*\.)?([^:]*:)', example.exc_msg)
- m2 = re.match(r'(?:[^:]*\.)?([^:]*:)', exc_msg)
- if m1 and m2 and check(m1.group(1), m2.group(1),
- self.optionflags):
+ if check(_strip_exception_details(example.exc_msg),
+ _strip_exception_details(exc_msg),
+ self.optionflags):
 outcome = SUCCESS
 
 # Report the outcome.
diff --git a/Lib/test/test_doctest.py b/Lib/test/test_doctest.py
--- a/Lib/test/test_doctest.py
+++ b/Lib/test/test_doctest.py
@@ -1054,6 +1054,33 @@
 ValueError: message
 TestResults(failed=1, attempted=1)
 
+If the exception does not have a message, you can still use
+IGNORE_EXCEPTION_DETAIL to normalize the modules between Python 2 and 3:
+
+ >>> def f(x):
+ ... r'''
+ ... >>> from http.client import HTTPException
+ ... >>> raise HTTPException() #doctest: +IGNORE_EXCEPTION_DETAIL
+ ... Traceback (most recent call last):
+ ... foo.bar.HTTPException
+ ... '''
+ >>> test = doctest.DocTestFinder().find(f)[0]
+ >>> doctest.DocTestRunner(verbose=False).run(test)
+ TestResults(failed=0, attempted=2)
+
+Note that a trailing colon doesn't matter either:
+
+ >>> def f(x):
+ ... r'''
+ ... >>> from http.client import HTTPException
+ ... >>> raise HTTPException() #doctest: +IGNORE_EXCEPTION_DETAIL
+ ... Traceback (most recent call last):
+ ... foo.bar.HTTPException:
+ ... '''
+ >>> test = doctest.DocTestFinder().find(f)[0]
+ >>> doctest.DocTestRunner(verbose=False).run(test)
+ TestResults(failed=0, attempted=2)
+
 If an exception is raised but not expected, then it is reported as an
 unexpected exception:
 
diff --git a/Misc/NEWS b/Misc/NEWS
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -18,6 +18,10 @@
 Library
 -------
 
+- Issue #19138: doctest's IGNORE_EXCEPTION_DETAIL now allows a match when
+ no exception detail exists (no colon following the exception's name, or
+ a colon does follow but no text follows the colon).
+
 - Issue #19827: On UNIX, setblocking() and settimeout() methods of
 socket.socket can now avoid a second syscall if the ioctl() function can be
 used, or if the non-blocking flag of the socket is unchanged.
-- 
Repository URL: http://hg.python.org/cpython
