confusion between global names and instantiated object variable names

[wanwan]

I'm trying to make a GUI, but for some of the instantiated object
variable names, the interpreter is looking at them as global names.
Here is an example of what I did:


class mygui:


def __init__(self, root):

self.menubar = Menu(root)

# Game Menu
self.menu1 = Menu(self.menub ar, tearoff=0)
self.menu1.add_ command(label=" Open File", command=donothi ng)
self.menu1.add_ separator()
self.menu1.add_ command(label=" Exit", command=root.qu it)
self.menubar.ad d_cascade(label ="File", menu=self.menu1 )

# ignoring the rest of the program ...


when I run my example, an error shows:
"NameError: global name'menubar' is not defined"

I wonder why it doesn't work. Isn't that the way to define an object
variable?

Any response would be appreciated.

[Piet van Oostrum]

Re: confusion between global names and instantiated object variable names

>>>>> "wanwan" <ericwan78@yaho o.com> (w) wrote:
[color=blue]
>w> I'm trying to make a GUI, but for some of the instantiated object
>w> variable names, the interpreter is looking at them as global names.
>w> Here is an example of what I did:[/color]

[color=blue]
>w> class mygui:[/color]

[color=blue]
>w> def __init__(self, root):[/color]
[color=blue]
>w> self.menubar = Menu(root)[/color]
[color=blue]
>w> # Game Menu
>w> self.menu1 = Menu(self.menub ar, tearoff=0)
>w> self.menu1.add_ command(label=" Open File", command=donothi ng)
>w> self.menu1.add_ separator()
>w> self.menu1.add_ command(label=" Exit", command=root.qu it)
>w> self.menubar.ad d_cascade(label ="File", menu=self.menu1 )[/color]
[color=blue]
>w> # ignoring the rest of the program ...[/color]

[color=blue]
>w> when I run my example, an error shows:
>w> "NameError: global name'menubar' is not defined"[/color]

If it talks about global name, it can't be self.menubar or
anything.menuba r. So there must be a soloist menubar reference somewhere.
Doesn't it tell you the line number?
--
Piet van Oostrum <piet@cs.uu.n l>
URL: http://www.cs.uu.nl/~piet [PGP 8DAE142BE17999C 4]
Private email: piet@vanoostrum .org

[wanwan]

Re: confusion between global names and instantiated object variable names

oops, of course.

Very careless mistake.

thx

[Alex Martelli]

Re: confusion between global names and instantiated object variable names

wanwan <ericwan78@yaho o.com> wrote:
...[color=blue]
> when I run my example, an error shows:
> "NameError: global name'menubar' is not defined"
>
> I wonder why it doesn't work. Isn't that the way to define an object
> variable?[/color]

The code you posted should not trigger this error. Most likely problem:
you have typed a comma where you meant to type a dot, for example
instead of self.menubar you wrote self,menubar somewhere -- it's a hard
error to spot with certain fonts.


Alex