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From: eryk sun <eryksun@gmail.com>
Newsgroups: comp.lang.python
Subject: Re: a clarification on the "global" statement sought
Date: Fri, 11 Mar 2016 03:20:32 -0600
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On Fri, Mar 11, 2016 at 2:13 AM, Charles T. Smith
<cts.private.yahoo@gmail.com> wrote:
> When might a "global" statement be used in the outermost level of a module?

You wouldn't need this in a normal module, because locals and globals
are the same. It may be useful if you're using exec with separate
locals and globals, and need to set a global. For example:

    source = 'global y; x, y = 1, 2'
    gvars, lvars = {}, {}
    exec(source, gvars, lvars)

    >>> lvars
    {'x': 1}
    >>> gvars['y']
    2

Probably you'll never need this.