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Jython doesn't follow PEP263 when parsing files with BOM header #257

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myzhan opened this issue Jun 17, 2023 · 1 comment

myzhan commented Jun 17, 2023

According to PEP263.

If a source file uses both the UTF-8 BOM mark signature and a magic encoding comment, the only allowed encoding for the comment is ‘utf-8’. Any other encoding will cause an error.

But jython doesn't report an error. It defaults the encoding to utf-8 and run it successfully.

Assuming this file has BOM header.

# coding: iso-8859-15
print("你好")

Jython will run it successfully while CPython will report an error.

lscoughlin commented Jul 16, 2023 •

edited

Given the nature of PEP263 and the way CPython (miss?)handled unicode 22 years ago, i'm not sure this is a bug exactly...

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