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#5491: clarify nested() semantics.

This commit is contained in:
Georg Brandl 2009-03-15 21:44:43 +00:00
parent ed4cefbedd
commit 5a95b21fee
1 changed files with 5 additions and 4 deletions
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9
Doc/library/contextlib.rst
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@ -63,14 +63,15 @@ Functions provided:
from contextlib import nested from contextlib import nested
with nested(A, B, C) as (X, Y, Z): with nested(A(), B(), C()) as (X, Y, Z):
do_something() do_something()
is equivalent to this:: is equivalent to this::
with A as X: m1, m2, m3 = A(), B(), C()
with B as Y: with m1 as X:
with C as Z: with m2 as Y:
with m3 as Z:
do_something() do_something()
Note that if the :meth:`__exit__` method of one of the nested context managers Note that if the :meth:`__exit__` method of one of the nested context managers