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[Python-Dev] bpo-36919: Exception from 'compile' reports a newline char not present in input

Guido van Rossum guido at python.org
Mon May 20 15:46:12 EDT 2019 
I answered (B) in the tracker.

On Mon, May 20, 2019 at 12:32 PM Pavel Koneski <pavel.koneski at gmail.com>
wrote:

> Hi,
>
> The following issue arose when implementing IronPython 3. Normally the
> behavior of CPython is authoritative, but in this case I started having
> doubts.
>
> Since Python 3.2, input in 'exec' mode  of 'compile' does not have to
> end in a newline anymore. However, it creates a surprising behavior when
> a 'SyntaxError' is reported:
>
> >>> try: compile('try', '<string>', 'exec')
> ... except SyntaxError as ex: print(repr(ex))
> ...
> SyntaxError('invalid syntax', ('<string>', 1, 4, 'try\n'))
>
> The 'text' field of the exception thrown contains an additional newline
> character that was not present in the input. Is it:
>
> a. Proper Python language behavior?
> b. CPython implementation artifact?
> c. A bug?
>
> The comments on bpo (https://bugs.python.org/issue36919) suggest Case B,
> but inconclusive. If case B it is, since IronPython does not exhibit
> this behavior, I will submit a patch to StdLib test(s) to make them
> implementation independent.
>
> Thanks for comments,
> Pavel
>
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-- 
--Guido van Rossum (python.org/~guido)
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