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-rw-r--r--Lib/_pydecimal.py2
-rw-r--r--Lib/test/test_traceback.py17
-rw-r--r--Lib/traceback.py2
-rw-r--r--Misc/NEWS4
4 files changed, 18 insertions, 7 deletions
diff --git a/Lib/_pydecimal.py b/Lib/_pydecimal.py
index 900a1a7..a5ea340 100644
--- a/Lib/_pydecimal.py
+++ b/Lib/_pydecimal.py
@@ -4106,7 +4106,7 @@ class Context(object):
>>> context.create_decimal_from_float(3.1415926535897932)
Traceback (most recent call last):
...
- decimal.Inexact
+ decimal.Inexact: None
"""
d = Decimal.from_float(f) # An exact conversion
diff --git a/Lib/test/test_traceback.py b/Lib/test/test_traceback.py
index 549d8d1..b4b74d3 100644
--- a/Lib/test/test_traceback.py
+++ b/Lib/test/test_traceback.py
@@ -19,7 +19,7 @@ test_frame = namedtuple('frame', ['f_code', 'f_globals', 'f_locals'])
test_tb = namedtuple('tb', ['tb_frame', 'tb_lineno', 'tb_next'])
-class SyntaxTracebackCases(unittest.TestCase):
+class TracebackCases(unittest.TestCase):
# For now, a very minimal set of tests. I want to be sure that
# formatting of SyntaxErrors works based on changes for 2.1.
@@ -106,10 +106,6 @@ class SyntaxTracebackCases(unittest.TestCase):
str_name = '.'.join([X.__module__, X.__qualname__])
self.assertEqual(err[0], "%s: %s\n" % (str_name, str_value))
- def test_without_exception(self):
- err = traceback.format_exception_only(None, None)
- self.assertEqual(err, ['None\n'])
-
def test_encoded_file(self):
# Test that tracebacks are correctly printed for encoded source files:
# - correct line number (Issue2384)
@@ -456,6 +452,17 @@ class BaseExceptionReportingTests:
msg = self.get_report(e).splitlines()
self.assertEqual(msg[-2], ' ^')
+ def test_message_none(self):
+ # A message that looks like "None" should not be treated specially
+ err = self.get_report(Exception(None))
+ self.assertIn('Exception: None\n', err)
+ err = self.get_report(Exception('None'))
+ self.assertIn('Exception: None\n', err)
+ err = self.get_report(Exception())
+ self.assertIn('Exception\n', err)
+ err = self.get_report(Exception(''))
+ self.assertIn('Exception\n', err)
+
class PyExcReportingTests(BaseExceptionReportingTests, unittest.TestCase):
#
diff --git a/Lib/traceback.py b/Lib/traceback.py
index a2eb539..c5fd617 100644
--- a/Lib/traceback.py
+++ b/Lib/traceback.py
@@ -140,7 +140,7 @@ def format_exception_only(etype, value):
def _format_final_exc_line(etype, value):
valuestr = _some_str(value)
- if value == 'None' or value is None or not valuestr:
+ if value is None or not valuestr:
line = "%s\n" % etype
else:
line = "%s: %s\n" % (etype, valuestr)
diff --git a/Misc/NEWS b/Misc/NEWS
index e6970a4..4d2fc0a 100644
--- a/Misc/NEWS
+++ b/Misc/NEWS
@@ -77,6 +77,10 @@ Core and Builtins
Library
-------
+- Issue #27348: In the traceback module, restore the formatting of exception
+ messages like "Exception: None". This fixes a regression introduced in
+ 3.5a2.
+
- Issue #25651: Allow falsy values to be used for msg parameter of subTest().
- Issue #27932: Prevent memory leak in win32_ver().