ethical questions about global variables

ianaré ianare at gmail.com
Tue Dec 16 18:01:17 CET 2008


For anything more complicated than a simple script, I find it easier
to use some sort of config object. This could be a simple dictionnary
type class, where the values can be set/retrieved by the other classes
directly, or a more elaborate class including functions to set/
retrieve the variables. This way setting/retrieving can be 'smart' --
possibly looking at other variables, program states, thread count,
whatever, for the requested config option. It also allows for a lot of
expansion down the line if need be, rather than dealing with all sorts
of global variables floating around - which gets annoying pretty
quickly.


On Dec 15, 9:45 pm, "Giampaolo Rodola'" <gne... at gmail.com> wrote:
> Hi,
> in a module of mine (ftpserver.py) I'd want to add a (boolean) global
> variable named "use_gmt_times" to decide whether the server has to
> return times in GMT or localtime but I'm not sure if it is a good idea
> because of the "ethical" doubts I'm gonna write below.
>
> In first place I've never liked global variables too much and always
> preferred per-class-instance variables instead.
> The problem in my case is that I have to use such variable in two
> separated classes: FTPHandler and VirtualFileSystem. Also, I want that
> for no reason one class uses times in GMT and the other one local
> times.
>
> Another doubt is the naming convention. PEP-8 states that global
> variables should use the lower_case_naming_convention but I've seen a
> lot of library module using the UPPER_CASE_NAMING_CONVENTION. What am
> I supposed to do about it?
>
> Thanks in advance for any comment.
>
> --- Giampaolohttp://code.google.com/p/pyftpdlib/




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