Message150092
| Author |
ncoghlan |
| Recipients |
Julian, eric.araujo, eric.snow, giampaolo.rodola, ncoghlan, nikratio, pitrou, rhettinger, smarnach |
| Date |
2011年12月22日.12:23:15 |
| SpamBayes Score |
0.0010876528 |
| Marked as misclassified |
No |
| Message-id |
<1324556596.68.0.701521354797.issue13585@psf.upfronthosting.co.za> |
| In-reply-to |
| Content |
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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