[issue21103] Encoding str to IDNA with ellipsis decomposes to empty labels

[Christopher Foo]

New submission from Christopher Foo:

When encoding a string with the IDNA codec I expected that it will always raise an exception with empty labels. When I do this

    >>> 'example.c…'.encode('idna').decode('ascii')

it returns

    'example.c...'

instead of raising UnicodeError. The original string ends with U+2026 HORIZONTAL ELLIPSIS if you can't see it clearly. These strings are coming from web pages in a web crawler.

I tested this on Python 3.4, 3.3.2, 2.7.5, 2.6.9.

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components: Library (Lib)
messages: 215189
nosy: chfoo
priority: normal
severity: normal
status: open
title: Encoding str to IDNA with ellipsis decomposes to empty labels
type: behavior

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue21103>
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