[issue3703] open() on directory raises IOError with unhelpful message

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

There is a call to dircheck(), but not in the correct place.
The attached patch makes sure that the "Is a directory" message is not
overwritten.

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keywords: +needs review, patch
nosy: +amaury.forgeotdarc
priority:  -> critical
Added file: http://bugs.python.org/file11270/dircheck.patch

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