[Tutor] Problems passing a parameter in a GUI

[James Reynolds]

You have other issues at play here, but to answer your question from below:

You are calling the method "reveal" prior to creating the global object
"secret_text"

You can try moving:

x=   self.submit_bttn=Button(self, text="Submit", command=self.reveal(x))


below self.secret_text = "...."

You will also find that you have not defined something called
"self.submit_bttn"

and there are more errors beyond that, but that's past the scope of your
question.

On Tue, Jan 18, 2011 at 4:36 PM, David Holland <davholla2002 at yahoo.co.uk>wrote:

> Hi All,
> I hope this makes sense
>
> I am trying to write a GUI where you click on a button and each time you
> click on the button it shows in the entry text how many times you have
> clicked.  However when I changed an earlier version of the code to pass a
> parameter it errors.
> This works :-
>
> from Tkinter import *
> class Application(Frame):
>     """GUI App"""
>     def __init__(self, master):
>         """Initialize the frame."""
>         Frame.__init__(self, master)
>         self.grid()
>         self.create_widgets()
>
>     def create_widgets(self):
>         self.inst_lbl=Label(self, text="Click on the button to get
> instructions")
>         self.inst_lbl.grid(row=0, column=0, columnspan=2, sticky=W)
>         self.pw_lbl=Label(self, text="Password")
>         self.submit_bttn=Button(self, text="Submit", command=self.reveal)
>         self.submit_bttn.grid(row=1, column=1, columnspan=2, sticky=W)
>         self.secret_text=Text(self, width=35, height=5, wrap=WORD)
>         self.secret_text.grid(row=2, column=1, columnspan=2, sticky=W)
>         self.helpinfo()
>
>     def reveal(self):
>         Calmexob = Calmex()
>         results = Calmexob.getmess()
>         self.secret_text.delete(0.0, END)
>         self.secret_text.insert(0.0,results)
>
>     def helpinfo(self):
>             self.secret_text.insert(0.0,"Start")
>
> class Calmex(object):
>
>     def __init__(self):
>         """Default arg"""
>
>
>     def getmess(self):
>         mesg="Test"
>         return mesg
>
> #main
> root=Tk()
> root.title("Test")
> root.geometry("400x300")
> app=Application(root)
> root.mainloop()
>
>
> But when I changed it to use a number I get an error message.
> Here is the code
> from Tkinter import *
> class Application(Frame):
>     """GUI App"""
>     def __init__(self, master):
>         """Initialize the frame."""
>         Frame.__init__(self, master)
>         self.grid()
>         x=0
>         self.create_widgets(x)
>
>     def create_widgets(self,x):
>         self.inst_lbl=Label(self, text="Click on the button to get
> instructions")
>         self.inst_lbl.grid(row=0, column=0, columnspan=2, sticky=W)
>         self.pw_lbl=Label(self, text="Password")
>         x=   self.submit_bttn=Button(self, text="Submit",
> command=self.reveal(x))
>         self.submit_bttn.grid(row=1, column=1, columnspan=2, sticky=W)
>         self.secret_text=Text(self, width=35, height=5, wrap=WORD)
>         self.secret_text.grid(row=2, column=1, columnspan=2, sticky=W)
>         self.helpinfo()
>
>     def reveal(self, x):
>         Calmexob = Calmex(x)
>         results = Calmexob.getmess(x)
>         self.secret_text.delete(0.0, END)
>         self.secret_text.insert(0.0,results)
>         x=x+1
>         return x
>
>     def helpinfo(self):
>             self.secret_text.insert(0.0,"Start")
>
> class Calmex(object):
>
>     def __init__(self,x):
>         """Default arg"""
>
>
>     def getmess(self,x):
>         mesg="Test"+str(x)
>         return mesg
>
> #main
> root=Tk()
> root.title("Test")
> root.geometry("400x300")
> app=Application(root)
> root.mainloop()
>
>
>
>
>
>
>
>
>
> The error message is
> AttributeError: Application instance has no attribute 'secret_text'
>
> The only change is that I have declared x and changed the function   reveal
> to take and pass x as an arguement.
>
> Thanks in advance.  I hope this makes sense.
>
>
>
>
>
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