[issue7951] Should str.format allow negative indexes when used for __getitem__ access?

[Eric Smith]

Eric Smith <eric at trueblade.com> added the comment:

Addressing just the last part of Mark's message right now:

The PEP goes on to say:
    Implementation note: The implementation of this proposal is
    not required to enforce the rule about a simple or dotted name
    being a valid Python identifier.  ...

I rely on getattr lookup failing for dotted names, but for simple names there's no check at all. I agree it's desirable to leave this behavior.

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