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Merge pull request #1770 from ellisonbg/cython_magic...
Merge pull request #1770 from ellisonbg/cython_magic Cython related magic functions: offers the new cell magics %%cython_inline, %%cython_pyximport and %%cython to make it very easy to put cython-accelerated code in a cell and have it loaded interactively.

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r7103:42f1e817 merge
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nested_context.py
50 lines | 1.5 KiB | text/x-python | PythonLexer
"""Backwards compatibility - we use contextlib.nested to support Python 2.6,
but it's removed in Python 3.2."""
# TODO : Remove this once we drop support for Python 2.6, and use
# "with a, b:" instead.
import sys
from contextlib import contextmanager
@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()
"""
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]