[issue3177] Add shutil.open

[Chris Rebert]

Chris Rebert <pybugs at rebertia.com> added the comment:

No, it isn't. Changing the `IOError(errno.ENOENT, "...`s to `FileNotFoundError("...`s would half fix it.

The other half, the `OSError(errno.ENOSYS)`s, has a FIXME for what's the right error to raise in that case ("no application associated with files of this type"). I have no idea myself. None of the new PEP 3151 errors apply. Nor did any of the errnos strictly speaking AFAICT; ENOSYS was the closest approximation I could find. Thoughts? Custom error class? Different errno? Something else?

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<http://bugs.python.org/issue3177>
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