Access to the caller's globals, not your own

[eryk sun]

On Mon, Nov 14, 2016 at 5:20 AM, Steven D'Aprano
<steve+comp.lang.python at pearwood.info> wrote:
> but what magic do I need? globals() is no good, because it returns the
> library's global namespace, not the caller's.
>
> Any solution ought to work for CPython, IronPython and Jython, at a minimum.

You can access the globals of the caller's frame, but you'll have to
research to what extent IronPython and Jython support CPython frame
objects.

FWIW:

    import inspect

    SPAMIFY = True

    def make_spam(n):
        caller_globals = inspect.currentframe().f_back.f_globals
        if caller_globals.get('SPAMIFY', SPAMIFY):
            return "spam" * n
        else:
            return "ham" * n

For example:

    >>> import library
    >>> library.make_spam(5)
    'spamspamspamspamspam'
    >>> SPAMIFY = False
    >>> library.make_spam(5)
    'hamhamhamhamham'