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Tkinter --> Why multiple windows

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  Tkinter -->  Why multiple windows kevind0718@gmail.com - 2016-03-24 13:24 -0700
    Re: Tkinter -->  Why multiple windows Random832 <random832@fastmail.com> - 2016-03-24 16:28 -0400
      Re: Tkinter -->  Why multiple windows kevind0718@gmail.com - 2016-03-24 13:43 -0700
        Re: Tkinter --> Why multiple windows Terry Reedy <tjreedy@udel.edu> - 2016-03-24 21:27 -0400
    Re: Tkinter -->  Why multiple windows Wildman <best_lay@yahoo.com> - 2016-03-24 20:24 -0500
      Re: Tkinter -->  Why multiple windows kevind0718@gmail.com - 2016-03-25 06:41 -0700
        Re: Tkinter -->  Why multiple windows Dennis Lee Bieber <wlfraed@ix.netcom.com> - 2016-03-25 13:03 -0400

#105650 — Tkinter --> Why multiple windows

Hello:

newbie Tkinter question

If I run the code below two windows appear.
One empty and one with the text box and button.

Why?  please

KD



from Tkinter import *

class MyDialog:
    def __init__(self, parent):

        top = self.top = Toplevel(parent)

        Label(top, text="Value").pack()

        self.e = Entry(top)
        self.e.pack(padx=5)

        b = Button(top, text="OK", command=self.ok)
        b.pack(pady=5)

    def ok(self):

        print "value is", self.e.get()

        self.top.destroy()


root = Tk()

d = MyDialog(root)

root.wait_window(d.top)

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#105651

On Thu, Mar 24, 2016, at 16:24, kevind0718@gmail.com wrote:
> Hello:
> 
> newbie Tkinter question
> 
> If I run the code below two windows appear.
> One empty and one with the text box and button.

The empty one is the root window.

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#105652

On Thursday, March 24, 2016 at 4:29:03 PM UTC-4, Random832 wrote:
> On Thu, Mar 24, 2016, at 16:24, kevind0718@gmail.com wrote:
> > Hello:
> > 
> > newbie Tkinter question
> > 
> > If I run the code below two windows appear.
> > One empty and one with the text box and button.
> 
> The empty one is the root window.

I kinda guessed that.  
Is there any downside to hiding it using root.withdraw().

thanks for quick responce.

KD

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#105674 — Re: Tkinter --> Why multiple windows

On 3/24/2016 4:43 PM, kevind0718@gmail.com wrote:
> On Thursday, March 24, 2016 at 4:29:03 PM UTC-4, Random832 wrote:
>> On Thu, Mar 24, 2016, at 16:24, kevind0718@gmail.com wrote:

>>> If I run the code below two windows appear.
>>> One empty and one with the text box and button.
 >>> Why?

The answer to that sort of question is nearly always "Because that is 
what you asked for"

>> The empty one is the root window.
> I kinda guessed that.
> Is there any downside to hiding it using root.withdraw().

In your example, there is no apparent reason to hid root and use a 
Toplevel.  IDLE, however, is currently a multiwindow application with no 
main window and it uses 'root.withdraw'.

(In fact, it appears to do so twice in the IDLE process -- possibly a 
mistake.)
-- 
Terry Jan Reedy

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#105673

On Thu, 24 Mar 2016 13:24:16 -0700, kevind0718 wrote:

> Hello:
> 
> newbie Tkinter question
> 
> If I run the code below two windows appear.
> One empty and one with the text box and button.
> 
> Why?  please
> 
> KD
> 
> 
> 
> from Tkinter import *
> 
> class MyDialog:
>     def __init__(self, parent):
> 
>         top = self.top = Toplevel(parent)
> 
>         Label(top, text="Value").pack()
> 
>         self.e = Entry(top)
>         self.e.pack(padx=5)
> 
>         b = Button(top, text="OK", command=self.ok)
>         b.pack(pady=5)
> 
>     def ok(self):
> 
>         print "value is", self.e.get()
> 
>         self.top.destroy()
> 
> 
> root = Tk()
> 
> d = MyDialog(root)
> 
> root.wait_window(d.top)

Try this:

from Tkinter import *

class MyDialog(Frame):

    def __init__(self, parent):
        Frame.__init__(self, parent)
        self.parent = parent
        self.pack(fill=BOTH, expand=1)
        self.parent.title("MyDialog")
        Label(self, text="Value").pack()
        self.e = Entry(self)
        self.e.pack(padx=5)
        self.b = Button(self, text="OK", command=self.ok)
        self.b.pack(pady=5)

    def ok(self):
        print "value is", self.e.get()

root = Tk()
d = MyDialog(root)
root.mainloop()

-- 
<Wildman> GNU/Linux user #557453
May the Source be with you.

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#105689

On Thursday, March 24, 2016 at 9:24:44 PM UTC-4, Wildman wrote:
> On Thu, 24 Mar 2016 13:24:16 -0700, kevind0718 wrote:
> 
> > Hello:
> > 
> > newbie Tkinter question
> > 
> > If I run the code below two windows appear.
> > One empty and one with the text box and button.
> > 
> > Why?  please
> > 
> > KD
> > 
> > 
> > 
> > from Tkinter import *
> > 
> > class MyDialog:
> >     def __init__(self, parent):
> > 
> >         top = self.top = Toplevel(parent)
> > 
> >         Label(top, text="Value").pack()
> > 
> >         self.e = Entry(top)
> >         self.e.pack(padx=5)
> > 
> >         b = Button(top, text="OK", command=self.ok)
> >         b.pack(pady=5)
> > 
> >     def ok(self):
> > 
> >         print "value is", self.e.get()
> > 
> >         self.top.destroy()
> > 
> > 
> > root = Tk()
> > 
> > d = MyDialog(root)
> > 
> > root.wait_window(d.top)
> 
> Try this:
> 
> from Tkinter import *
> 
> class MyDialog(Frame):
> 
>     def __init__(self, parent):
>         Frame.__init__(self, parent)
>         self.parent = parent
>         self.pack(fill=BOTH, expand=1)
>         self.parent.title("MyDialog")
>         Label(self, text="Value").pack()
>         self.e = Entry(self)
>         self.e.pack(padx=5)
>         self.b = Button(self, text="OK", command=self.ok)
>         self.b.pack(pady=5)
> 
>     def ok(self):
>         print "value is", self.e.get()
> 
> root = Tk()
> d = MyDialog(root)
> root.mainloop()
> 
> -- 
> <Wildman> GNU/Linux user #557453
> May the Source be with you.


Looking at the lines below 
As related to the code I posted above.
I believe this code will allow me to instantiate the class
MyDialog, wait until the window is destroyed and then 
continue on my merry way.

root = Tk()
d = MyDialog(root)
root.wait_window(d.top) 


Now if I pass an instance of  Unamepword into the constructor of
MyDialog(unamepword) , I can modify uStr and pWord in MyDialog and 
the local copy will get updated.  
Correct?

class Unamepword:
    ## 
    ## class to hold user name and pWord for Database
    uName = None
    pWord = None
    def __init__(self, uStr, pStr):
        self.uName = uStr
        self.pWord = pStr

Many thanks for your attention to this matter.

KD

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#105697

On Fri, 25 Mar 2016 06:41:48 -0700 (PDT), kevind0718@gmail.com declaimed
the following:


>class Unamepword:
>    ## 
>    ## class to hold user name and pWord for Database
>    uName = None
>    pWord = None

	Those are essentially useless...

>    def __init__(self, uStr, pStr):

		uStr and pStr are required arguments to the instance creation, and

>        self.uName = uStr
>        self.pWord = pStr
>
here you bind them to the instance specific uName/pWord attributes. The
class-wide uName/pWord will never be visible unless somewhere you
explicitly use
		Unamepword.uName
or 
		Unamepword.pWord 
in some method of the class, in order to bypass the instance attribute.

	Since you don't show the entire class I can't comment further -- if all
it does is set those attributes you could just as easily use a dictionary

login = Unamepword("bob", "secret")

print login.uName, login.pWord

vs

login = {	"uName" : "bob",		"pWord" : "secret" }

print login["uName"], login["pWord"]

	Note: I'm not necessarily recommending the latter -- just offering
alternatives... If you assume username is always first a simple tuple might
do

login = ("bob", "secret")
print login[0], login[1]

...

UNAME = 0
PWORD = 1

print login[UNAME], login[PWORD]
-- 
	Wulfraed                 Dennis Lee Bieber         AF6VN
    wlfraed@ix.netcom.com    HTTP://wlfraed.home.netcom.com/

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