Thanks Ben Finney. So it's understood very well.
Ben Finney ha escrito:
> "GinTon" <[EMAIL PROTECTED]> writes:
>
> > Is the same use
>> >>> sys.stderr.write('error message'); sys.exit(1)
> > than
>> >>> sys.exit('error message') ?
>
> Code that wants to catch SystemExit will get a different exception
> object in each case::
>
> >>> import sys
> >>> from StringIO import StringIO
> >>> sys.stderr = StringIO()
>
> >>> try:
> ... sys.stderr.write('error message')
> ... sys.exit(1)
> ... except SystemExit, e:
> ... print "stderr contains:", sys.stderr.getvalue()
> ... print "e.code is:", e.code
> ...
> stderr contains: error message
> e.code is: 1
>
> >>> try:
> ... sys.exit('error message')
> ... except SystemExit, e:
> ... print "stderr contains:", sys.stderr.getvalue()
> ... print "e.code is:", e.code
> ...
> stderr contains: error message
> e.code is: error message
>
> I quite often catch SystemExit in unit tests, or other code that is
> inspecting a program module.
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