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Code Issues Projects Releases Packages Wiki Activity Actions 7

Implicit exception chaining via __context__ (PEP 3134).

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Patch 3108 by Antooine Pitrou.
This commit is contained in:
Guido van Rossum 2008-06-14 20:20:24 +00:00
parent 973124fd70
commit b4fb6e4d27
4 changed files with 139 additions and 33 deletions
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122
Lib/test/test_raise.py
View file

@ -181,32 +181,102 @@ class TestTraceback(unittest.TestCase):
self.fail("No exception raised")
# Disabled until context is implemented
# class TestContext(object):
# def test_instance_context_bare_raise(self):
# context = IndexError()
# try:
# try:
# raise context
# except:
# raise OSError()
# except OSError as e:
# self.assertEqual(e.__context__, context)
# else:
# self.fail("No exception raised")
#
# def test_class_context_bare_raise(self):
# context = IndexError
# try:
# try:
# raise context
# except:
# raise OSError()
# except OSError as e:
# self.assertNotEqual(e.__context__, context)
# self.failUnless(isinstance(e.__context__, context))
# else:
# self.fail("No exception raised")
class TestContext(unittest.TestCase):
def test_instance_context_instance_raise(self):
context = IndexError()
try:
try:
raise context
except:
raise OSError()
except OSError as e:
self.assertEqual(e.__context__, context)
else:
self.fail("No exception raised")
def test_class_context_instance_raise(self):
context = IndexError
try:
try:
raise context
except:
raise OSError()
except OSError as e:
self.assertNotEqual(e.__context__, context)
self.failUnless(isinstance(e.__context__, context))
else:
self.fail("No exception raised")
def test_class_context_class_raise(self):
context = IndexError
try:
try:
raise context
except:
raise OSError
except OSError as e:
self.assertNotEqual(e.__context__, context)
self.failUnless(isinstance(e.__context__, context))
else:
self.fail("No exception raised")
def test_c_exception_context(self):
try:
try:
1/0
except:
raise OSError
except OSError as e:
self.failUnless(isinstance(e.__context__, ZeroDivisionError))
else:
self.fail("No exception raised")
def test_c_exception_raise(self):
try:
try:
1/0
except:
xyzzy
except NameError as e:
self.failUnless(isinstance(e.__context__, ZeroDivisionError))
else:
self.fail("No exception raised")
def test_noraise_finally(self):
try:
try:
pass
finally:
raise OSError
except OSError as e:
self.failUnless(e.__context__ is None)
else:
self.fail("No exception raised")
def test_raise_finally(self):
try:
try:
1/0
finally:
raise OSError
except OSError as e:
self.failUnless(isinstance(e.__context__, ZeroDivisionError))
else:
self.fail("No exception raised")
def test_context_manager(self):
class ContextManager:
def __enter__(self):
pass
def __exit__(self, t, v, tb):
xyzzy
try:
with ContextManager():
1/0
except NameError as e:
self.failUnless(isinstance(e.__context__, ZeroDivisionError))
else:
self.fail("No exception raised")
class TestRemovedFunctionality(unittest.TestCase):