Use of statement 'global' in scripts.

[Popov, Dmitry Yu]

Thank you!
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From: Python-list <python-list-bounces+dpopov=anl.gov at python.org> on behalf of Greg Ewing via Python-list <python-list at python.org>
Sent: Wednesday, May 8, 2024 3:56 AM
To: python-list at python.org <python-list at python.org>
Subject: Re: Use of statement 'global' in scripts.

On 8/05/24 1: 32 pm, Popov, Dmitry Yu wrote: > The statement 'global', indicating variables living in the global scope, is very suitable to be used in modules. I'm wondering whether in scripts, running at the top-level invocation of the interpreter,
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On 8/05/24 1:32 pm, Popov, Dmitry Yu wrote:
> The statement 'global', indicating variables living in the global scope, is very suitable to be used in modules. I'm wondering whether in scripts, running at the top-level invocation of the interpreter, statement 'global' is used exactly the same way as in modules?

The 'global' statement declares a name to be module-level, so there's no
reason to use it at the top level of either a script or a module, since
everything there is module-level anyway.

You only need it if you want to assign to a module-level name from
within a function, e.g.

spam = 17

def f():
   global spam
   spam = 42

f()
# spam is now 42

A script is a module, so everything that applies to modules also
applies to scripts.

--
Greg
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