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import sys
def typename(t):
name = type(t).__name__
if sys.version_info < (2,5):
if name == 'classobj' and issubclass(t, MyException):
name = 'type'
elif name == 'instance' and isinstance(t, MyException):
name = 'MyException'
return "<type '%s'>" % name
class MyException(Exception):
pass
class ContextManager(object):
def __init__(self, value, exit_ret = None):
self.value = value
self.exit_ret = exit_ret
def __exit__(self, a, b, tb):
print("exit %s %s %s" % (typename(a), typename(b), typename(tb)))
return self.exit_ret
def __enter__(self):
print("enter")
return self.value
def multimanager():
"""
>>> multimanager()
enter
enter
enter
enter
enter
enter
2
value
1 2 3 4 5
nested
exit <type 'NoneType'> <type 'NoneType'> <type 'NoneType'>
exit <type 'NoneType'> <type 'NoneType'> <type 'NoneType'>
exit <type 'NoneType'> <type 'NoneType'> <type 'NoneType'>
exit <type 'NoneType'> <type 'NoneType'> <type 'NoneType'>
exit <type 'NoneType'> <type 'NoneType'> <type 'NoneType'>
exit <type 'NoneType'> <type 'NoneType'> <type 'NoneType'>
"""
with ContextManager(1), ContextManager(2) as x, ContextManager('value') as y,\
ContextManager(3), ContextManager((1, 2, (3, (4, 5)))) as (a, b, (c, (d, e))):
with ContextManager('nested') as nested:
print(x)
print(y)
print('%s %s %s %s %s' % (a, b, c, d, e))
print(nested)
class GetManager(object):
def get(self, *args):
return ContextManager(*args)
def manager_from_expression():
"""
>>> manager_from_expression()
enter
1
exit <type 'NoneType'> <type 'NoneType'> <type 'NoneType'>
enter
2
exit <type 'NoneType'> <type 'NoneType'> <type 'NoneType'>
"""
with GetManager().get(1) as x:
print(x)
g = GetManager()
with g.get(2) as x:
print(x)
# Tests borrowed from pyregr test_with.py,
# modified to follow the constraints of Cython.
import unittest
class Dummy(object):
def __init__(self, value=None, gobble=False):
if value is None:
value = self
self.value = value
self.gobble = gobble
self.enter_called = False
self.exit_called = False
def __enter__(self):
self.enter_called = True
return self.value
def __exit__(self, *exc_info):
self.exit_called = True
self.exc_info = exc_info
if self.gobble:
return True
class InitRaises(object):
def __init__(self): raise RuntimeError()
class EnterRaises(object):
def __enter__(self): raise RuntimeError()
def __exit__(self, *exc_info): pass
class ExitRaises(object):
def __enter__(self): pass
def __exit__(self, *exc_info): raise RuntimeError()
class NestedWith(unittest.TestCase):
"""
>>> NestedWith().runTest()
"""
def runTest(self):
self.testNoExceptions()
self.testExceptionInExprList()
self.testExceptionInEnter()
self.testExceptionInExit()
self.testEnterReturnsTuple()
def testNoExceptions(self):
with Dummy() as a, Dummy() as b:
self.assertTrue(a.enter_called)
self.assertTrue(b.enter_called)
self.assertTrue(a.exit_called)
self.assertTrue(b.exit_called)
def testExceptionInExprList(self):
try:
with Dummy() as a, InitRaises():
pass
except:
pass
self.assertTrue(a.enter_called)
self.assertTrue(a.exit_called)
def testExceptionInEnter(self):
try:
with Dummy() as a, EnterRaises():
self.fail('body of bad with executed')
except RuntimeError:
pass
else:
self.fail('RuntimeError not reraised')
self.assertTrue(a.enter_called)
self.assertTrue(a.exit_called)
def testExceptionInExit(self):
body_executed = False
with Dummy(gobble=True) as a, ExitRaises():
body_executed = True
self.assertTrue(a.enter_called)
self.assertTrue(a.exit_called)
self.assertTrue(body_executed)
self.assertNotEqual(a.exc_info[0], None)
def testEnterReturnsTuple(self):
with Dummy(value=(1,2)) as (a1, a2), \
Dummy(value=(10, 20)) as (b1, b2):
self.assertEqual(1, a1)
self.assertEqual(2, a2)
self.assertEqual(10, b1)
self.assertEqual(20, b2)
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