[issue29809] TypeError in traceback.print_exc - unicode does not have the buffer interface

[Serhiy Storchaka]

Serhiy Storchaka added the comment:

format_exception_only() produces a Unicode string for SyntaxError with Unicode source line.

>>> traceback.format_exception_only(SyntaxError, SyntaxError('failed', ('<tokenize>', 7, 2, u'  // test')))
['  File "<tokenize>", line 7\n', u'    // test\n', '    ^\n', 'SyntaxError: failed\n']

But io.BytesIO() accepts only binary strings.

The similar issue is caused by Unicode file name:

>>> traceback.format_exception_only(SyntaxError, SyntaxError('failed', (u'<tokenize>', 7, 2, '  // test')))
[u'  File "<tokenize>", line 7\n', '    // test\n', '    ^\n', 'SyntaxError: failed\n']

But Unicode error message doesn't produce Unicode output:

>>> traceback.format_exception_only(SyntaxError, SyntaxError(u'failed', ('<tokenize>', 7, 2, '  // test')))
['  File "<tokenize>", line 7\n', '    // test\n', '    ^\n', 'SyntaxError: failed\n']

How you got a Unicode source line in SyntaxError?

----------
components: +Library (Lib), Unicode
nosy: +ezio.melotti, haypo, serhiy.storchaka
type:  -> behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue29809>
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