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Issue #24695: Fix a regression in traceback.print_exception()

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If exc_traceback is None we shouldn't print a traceback header
like described in the documentation.
This commit is contained in:
Berker Peksag 2015-07-24 17:36:21 +03:00
parent c19bb3279c
commit c3f417dc47
3 changed files with 20 additions and 1 deletions
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13
Lib/test/test_traceback.py
View file

@ -209,6 +209,13 @@ class SyntaxTracebackCases(unittest.TestCase):
b'ZeroDivisionError: division by zero']
self.assertEqual(stderr.splitlines(), expected)
def test_print_exception(self):
output = StringIO()
traceback.print_exception(
Exception, Exception("projector"), None, file=output
)
self.assertEqual(output.getvalue(), "Exception: projector\n")
class TracebackFormatTests(unittest.TestCase):
@ -848,6 +855,12 @@ class TestTracebackException(unittest.TestCase):
exc = traceback.TracebackException(Exception, e, tb)
self.assertEqual(exc.stack[0].locals, None)
def test_traceback_header(self):
# do not print a traceback header if exc_traceback is None
# see issue #24695
exc = traceback.TracebackException(Exception, Exception("haven"), None)
self.assertEqual(list(exc.format()), ["Exception: haven\n"])
class MiscTest(unittest.TestCase):