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comp / comp.lang.python / Re: Use of statement 'global' in scripts.

SubjectAuthor
* Use of statement 'global' in scripts.Popov, Dmitry Yu
`* Re: Use of statement 'global' in scripts.Greg Ewing
 `- Re: Use of statement 'global' in scripts.Popov, Dmitry Yu

1
Subject: Use of statement 'global' in scripts.
From: Popov, Dmitry Yu
Newsgroups: comp.lang.python
Date: Wed, 8 May 2024 01:32 UTC
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From: dpopov@anl.gov (Popov, Dmitry Yu)
Newsgroups: comp.lang.python
Subject: Use of statement 'global' in scripts.
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Dear Sirs.

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? If there are any differences, I would really appreciate any comments on this.

Regards,
Dmitry Popov

Lemont, IL
USA

Subject: Re: Use of statement 'global' in scripts.
From: Greg Ewing
Newsgroups: comp.lang.python
Date: Wed, 8 May 2024 08:56 UTC
References: 1 2
Path: eternal-september.org!news.eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!individual.net!not-for-mail
From: greg.ewing@canterbury.ac.nz (Greg Ewing)
Newsgroups: comp.lang.python
Subject: Re: Use of statement 'global' in scripts.
Date: Wed, 8 May 2024 20:56:00 +1200
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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

Subject: Re: Use of statement 'global' in scripts.
From: Popov, Dmitry Yu
Newsgroups: comp.lang.python
Date: Wed, 8 May 2024 18:52 UTC
References: 1 2 3 4
Path: eternal-september.org!news.eternal-september.org!feeder3.eternal-september.org!fu-berlin.de!uni-berlin.de!not-for-mail
From: dpopov@anl.gov (Popov, Dmitry Yu)
Newsgroups: comp.lang.python
Subject: Re: Use of statement 'global' in scripts.
Date: Wed, 8 May 2024 18:52:57 +0000
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Thread-Topic: Use of statement 'global' in scripts.
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Thank you!
________________________________
From: Python-list <python-list-bounces+dpopov=anl.gov@python.org> on behalf of Greg Ewing via Python-list <python-list@python.org>
Sent: Wednesday, May 8, 2024 3:56 AM
To: python-list@python.org <python-list@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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