Mass Deface
):
try:
yield
finally:
This makes this:
with some_generator() as :
equivalent to this:
try:
=
finally:
"""
@wraps(func)
def helper(*args, **kwds):
return GeneratorContextManager(func(*args, **kwds))
return helper
@contextmanager
def nested(*managers):
"""Combine multiple context managers into a single nested context manager.
This function has been deprecated in favour of the multiple manager form
of the with statement.
The one advantage of this function over the multiple manager form of the
with statement is that argument unpacking allows it to be
used with a variable number of context managers as follows:
with nested(*managers):
do_something()
"""
warn("With-statements now directly support multiple context managers",
DeprecationWarning, 3)
exits = []
vars = []
exc = (None, None, None)
try:
for mgr in managers:
exit = mgr.__exit__
enter = mgr.__enter__
vars.append(enter())
exits.append(exit)
yield vars
except:
exc = sys.exc_info()
finally:
while exits:
exit = exits.pop()
try:
if exit(*exc):
exc = (None, None, None)
except:
exc = sys.exc_info()
if exc != (None, None, None):
# Don't rely on sys.exc_info() still containing
# the right information. Another exception may
# have been raised and caught by an exit method
raise exc[0], exc[1], exc[2]
class closing(object):
"""Context to automatically close something at the end of a block.
Code like this:
with closing(.open()) as f:
is equivalent to this:
f = .open()
try:
finally:
f.close()
"""
def __init__(self, thing):
self.thing = thing
def __enter__(self):
return self.thing
def __exit__(self, *exc_info):
self.thing.close()