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Windows encodings, "win1252" and so forth, are named differently in Python, like "cp1252". Also, if the PyUnicode_AsEncodedString() function call fails for some reason, use a plain ereport(), not a PLy_elog(), to report that error. That avoids recursion and crash, if PLy_elog() tries to call PLyUnicode_Bytes() again. This fixes bug reported by Asif Naeem. Backpatch down to 9.0, before that plpython didn't even try these conversions. Jan Urbański, with minor comment improvements by me.