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Showing content from https://mail.python.org/pipermail/python-dev/2002-February/019909.html below:

[Python-Dev] Accessing globals without dict lookup

[Python-Dev] Accessing globals without dict lookup [Python-Dev] Accessing globals without dict lookupSkip Montanaro skip@pobox.com
Sun, 10 Feb 2002 16:35:49 -0600
    Tim> There's the problem of object identity: it's possible for exec'ed
    Tim> code to mutate the original dict while the exec'ed code is running,
    Tim> and Guido gave an example where that can matter.  

In the face of exec statements or calls to execfile can't the compiler just
generate the usual LOAD_NAME fallback instead of the new-fangled LOAD_GLOBAL
opcode?

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