Can global variable be passed into Python function?

Ben Finney ben+python at benfinney.id.au
Sat Mar 1 23:34:15 CET 2014


Marko Rauhamaa <marko at pacujo.net> writes:

> Ben Finney <ben+python at benfinney.id.au>:
>
> > No. I'm telling you that ‘is’ is *wrong* for comparing strings,
> > because it is unreliable.
>
> No, it isn't as long as the string object references have a common
> assignment "pedigree." Assignment (including parameter passing) is
> guaranteed to preserve identity of any object.

The unreliability isn't “will the same object have the same identity?”.
The unreliability is “will objects defined elsewhere have a different
identity?” In the case of Python strings, the latter question is not
reliably answerable from the programmer's perspective.

You are obstinately ignoring the point that the identity of a string is
*not* guaranteed to be different from a string with the same value.

Since you're persistently misconstruing what is being said to you, I'm
not going to run through it all again.

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Ben Finney




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