# raised inside the "with" statement from being suppressed.

return exc is not value

except RuntimeError as exc:

# Don't re-raise the passed in exception. (issue27112)

if exc is value:

return False

# Likewise, avoid suppressing if a StopIteration exception

# was passed to throw() and later wrapped into a RuntimeError

# (see PEP 479).

stack.push(cm)

self.assertIs(stack._exit_callbacks[-1], cm)

def test_dont_reraise_RuntimeError(self):

"""https://bugs.python.org/issue27122"""

class UniqueException(Exception): pass

@contextmanager

def second():

try:

yield 1

except Exception as exc:

raise UniqueException("new exception") from exc

@contextmanager

def first():

try:

yield 1

except Exception as exc:

raise exc

# The RuntimeError should be caught by second()'s exception

# handler which chain raised a new UniqueException.

with self.assertRaises(UniqueException) as err_ctx:

with ExitStack() as es_ctx:

es_ctx.enter_context(second())

es_ctx.enter_context(first())

raise RuntimeError("please no infinite loop.")

self.assertEqual(err_ctx.exception.args[0], "new exception")

class TestRedirectStream:

Library

-------

- Issue #27123: When an exception is raised within the context being managed

by a contextlib.ExitStack() and one of the exit stack generators

catches and raises it in a chain, do not re-raise the original exception

when exiting, let the new chained one through. This avoids the PEP 479

bug described in issue25782.

- Issue #27278: Fix os.urandom() implementation using getrandom() on Linux.

Truncate size to INT_MAX and loop until we collected enough random bytes,

instead of casting a directly Py_ssize_t to int.