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Showing content from https://mail.python.org/pipermail/python-dev/2002-March/021484.html below:

[Python-Dev] A Hygienic Macro System in Python?

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barry@zope.com (Barry A. Warsaw) writes:

> >>>>> "BH" == Bernhard Herzog <bh@intevation.de> writes:
> 
>     |    doc.BeginTransaction()
>     |    try:
>     |         try:
>     |             something()
>     |         except:
>     |             # an error occurred part way through. make sure everything
>     |             # is reverted (sort of a rollback)
>     |             doc.AbortTransaction()
>     |    finally:
>     |         doc.EndTransaction()
> 
> Interesting.  I have similar idioms that I use, except that I
> invariably would add bare raise after the AbortTransaction().

That's more or less what AbortTransaction does when it's finished. 

   Bernhard

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