[Python-ideas] "try with" syntactic sugar

[Christian Heimes]

Daniel Stutzbach wrote
> try with something as f:
>     many lines of code
> except some_error:
>     handle error
> 
> It saves one line of vertical space, and gets rid of an indentation level
> for the bulk of the code that rests within the "with" statement.  Thoughts?

Your proposal sounds like a very good idea. +1 from me.

I like to push your proposal even further and add the full set of exept,
else, finally blocks to the with statement. Additionally I'd like to
have multiple arguments, too.

Example
-------
log.info("Starting copy")
with somelock, open(infile, 'r') as fin, open(outfile, 'w') as fout:
    fout.write(fin.read())
except Excption:
    log.exception("An error has occured")
else:
    log.info("Copy successful")
finally:
    log.info("All done")

Equivalent
----------

log.info("Starting copy")
try:
    with somelock:
        with open(infile, 'r') as fin:
            with open(outfile, 'w') as fout:
                fout.write(fin.read())
except Excption:
    log.exception("An error has occured")
else:
    log.info("Copy successful")
finally:
    log.info("All done")


Christian