<script >Python and the PPG global variable? 2005-04-22 - By Bernard Lebel
Back
Is PPG indeed defined somewhere? If so, where?
Perhaps you are running into a scope problem, wich is critical in
Python. Keep in mind that a name assigned on the wrong scope will
prevent it from being usable in other scopes.
For instance, if you run a command that assigns a name a the top level
(a global for the entire script), this global will not be accessible
outside this file unless you import the file as a module and then
fetch the variable by name qualification (ie: myvariable =
modulename.variablename).
Normally functions inside a module can access all global names from
that same module, but not from other functions, unless all these
functions are nested into another function and the name is assigned in
that one. The only way to make a name global from a function is to
declare it first as global (with the global statement), then assign it
to a value.
Cheers
Bernard
On 4/22/05, Nick <nick.petit@(protected)> wrote:
> I haven't seen any docs or examples of creating dynamic ppgs done in
> Python but I'm sure it must be feasable... so far I can't seem to get
> the PPG global variable to work with the OnChange callback... I'm
> probably doing this entirely wrong as I'm still fumbling around in the
> dark, but this works in jscript and in vbs but I can't seem to make it
> work in python...
>
> olayout.Logic = str(OnInit()) + \
> str(Cons_OnChanged())
>
> # then I define my functions
>
> def OnInit(opset):
> olayout = PPG.PPGLayout
>
> This keeps on returning this error:
>
> #ERROR : Traceback (most recent call last):
> # File "<Script Block >", line 100, in ?
> # PPGCreator()
> # File "<Script Block >", line 38, in PPGCreator
> # olayout.Logic = str(OnInit(opset)) + str(Cons_OnChanged(opset))
> # File "<Script Block >", line 41, in OnInit
> # olayout = PPG.PPGLayout
> #NameError: global name 'PPG' is not defined
> # - [line 41]
>
> I can hack it in a very fugly way so it will work on init by passing
> the functions the actual custom prop object as a variable, but after
> it's been created this variable no longer exists in the logic section
> and I'd rather not get it using a Dictionary.GetObject as it's just
> not reliable enough. If someone could shed some light on where I've
> gone wrong that would be really appreciated... :)
>
> Cheers!
> Nick.
>
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