Nick Coghlan <[email protected]> added the comment:
The comparison to Go's defer statement is interesting, though:
ContextStack.register basically *is* the same as defer. While a nested with
statement is a better option in Python, if we ignore that for the moment, you
*could* write that simply copying example:
with ContextStack() as stack:
src = open(source)
stack.register(src.close)
dest = open(destination, 'w')
stack.register(dest.close)
copy(src, dest)
However, since ContextStack is just an ordinary context manager class, you have
a lot of flexibility in what you do with it (particularly once I add the
preserve() API to let you deliberately *skip* the cleanup steps by transferring
them to a new ContextStack object)
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<http://bugs.python.org/issue13585>
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