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

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', '', 'exec') ... except SyntaxError as ex: print(repr(ex)) ... SyntaxError('invalid syntax', ('', 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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