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devel / comp.lang.python / Re: Variable scope inside and outside functions - global statement being overridden by assignation unless preceded by reference

SubjectAuthor
o Re: Variable scope inside and outside functions - global statement being overridCameron Simpson

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Re: Variable scope inside and outside functions - global statement being overridden by assignation unless preceded by reference

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From: cs@cskk.id.au (Cameron Simpson)
Newsgroups: comp.lang.python
Subject: Re: Variable scope inside and outside functions - global statement
being overridden by assignation unless preceded by reference
Date: Fri, 8 Mar 2024 09:48:08 +1100
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 by: Cameron Simpson - Thu, 7 Mar 2024 22:48 UTC

On 06Mar2024 15:12, Jacob Kruger <jacob.kruger.work@gmail.com> wrote:
>So, this does not make sense to me in terms of the following snippet
>from the official python docs page:
>https://docs.python.org/3/faq/programming.html
>
>"In Python, variables that are only referenced inside a function are
>implicitly global. If a variable is assigned a value anywhere within
>the function’s body, it’s assumed to be a local unless explicitly
>declared as global."
>
>So, I would then assume that if I explicitly include a variable name
>inside the global statement, then even just assigning it a new value
>should update the variable in the global context, outside the
>function?

Yes. Note that the "global" namespace is the module in which the
function is defined.

x = 1

def f(n):
global x
x += n

This updates the `x` global variable in the module where `f` was
defined.

If you import `f` and use it in another module it will _still_ update
`x` in the original module namespace.

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