PL/Python: Report argument parsing errors using exceptions

Peter Eisentraut <peter_e@gmx.net>

Commit: 3a4a33ad49e7887b104a29323e4ea625d164a139
Author: Peter Eisentraut <peter_e@gmx.net>
Date: 2016-07-03T02:53:14Z
Releases: 9.6.0
PL/Python: Report argument parsing errors using exceptions

Instead of calling PLy_elog() for reporting Python argument parsing
errors, generate appropriate exceptions.  This matches the existing plpy
functions and is more consistent with the behavior of the Python
argument parsing routines.

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