tkinter, annoying grid-problem

[jim-on-linux]

On Friday 11 April 2008 18:41, 
skanemupp at yahoo.se wrote:
> so my little calculator works perfectly
> now. just having some trouble with the
> layout.
> this whole tkinter-thing seems to be more
> tricky than it should be. how can i make
> the 4 column of buttons have the same
> distance and size  between them as the
> other 3 columns? and how can i make the
> top entry end where the 2nd row entry
> ends(meaning the top entry will be
> longer)?
>
> why are the 4th row split from the others?
> hard to fix the problems when u dont even
> understand why things happen. seems so
> llogical a lot of it. i change something
> then something unexpected happens.
>
Look this file over.

I built two additional frames.
You can control the looks of the progect 
easier with the additional frames.

The calculator DOES NOT WORK.  You will have 
to have to play with it to get the results 
that you want, which you can do.

jim-on-linux
http://www.inqvista.com
######################################


class Calc :
    def __init__ (self) :
         self.mygui = Tk()
         self.mygui.title("Calculator")
         self.MkButtons()

    def MkButtons(self):
        mygui = self.mygui
        dataFra = Frame(mygui)
        dataFra.grid(row = 0, column = 0)
        l = Label(dataFra, text="Answer: ")
        l.grid(row=0, column=0, sticky=EW)
        self.e = Entry(dataFra)
        self.e.grid(row=1, column=0, 
sticky=EW)
        c = Entry(dataFra)
        c.grid(row=2, column=0, sticky=EW)

        x = 1
        y = 4

        butFra = Frame(mygui)
        butFra.grid(row=1, column=0)
        for n in '123+456-789*0()/.':
            b = Button(butFra, text= n,
               command = 
lambda :self.Disp(n),
            width=2, height=1)
            b.grid(row=y, column=x, sticky=W)
            x=x+1
            if x==5:
                x=1
                y=y+1


        b = Button(butFra, text="^", 
command=self.Disp, width=2,
                      height=1)
        b.grid(row=8, column=2, sticky=W)
        b = Button(butFra, 
text="C",command=self.Erase, width=2, 
height=1)
        b.grid(row=8, column=3, sticky=W)
        b = Button(butFra, 
text="c",command=self.Backspace, width=2, 
height=1)
        b.grid(row=8, column=4, sticky=W)
        b = Button(butFra, 
text="=",command=self.Calc, width=18, 
height=1)
        b.grid(row=9, column=1, columnspan=4, 
sticky=EW)



    def Disp(self, n):
        print n, '## n cal 68\n'
        n = ord(n)
        self.e.insert( 0,str( n))

    def Calc(self):
        expr=e.get()
        c.delete(0, END)
        try:
            c.insert(END, eval(expr))
        except:
            c.insert(END, "Not computable")


    def Erase(self):
             e.delete(0,END)
             c.delete(0, END)

    def Backspace(self):
             a=len(e.get())
             e.delete(a-1,END)
             #e.delete(INSERT, END)
             #e.delete(ANCHOR,END)



if __name__ == '__main__' :
    Calc()
    mainloop()





###################################
###################################
> from __future__ import division
> import Tkinter
> from Tkinter import *
>
> mygui = Tkinter.Tk()
>
> mygui.title("Calculator")
>
> l = Label(mygui, text="Answer: ")
> l.grid(row=2, column=1, columnspan=2,
> sticky=W)
>
> e = Entry(mygui)
> e.grid(row=1, column=1, columnspan=4,
> sticky=W)
>
> c = Entry(mygui)
> c.grid(row=2, column=3, columnspan=4,
> sticky=W)
>
> def Disp(nstr):
>     e.insert(INSERT, nstr)
>
> def Calc():
>     expr=e.get()
>     c.delete(0, END)
>     try:
>         c.insert(END, eval(expr))
>     except:
>         c.insert(END, "Not computable")
>
> def Erase():
>     e.delete(0,END)
>     c.delete(0, END)
>
> def Backspace():
>     a=len(e.get())
>     e.delete(a-1,END)
>     #e.delete(INSERT, END)
>     #e.delete(ANCHOR,END)
>
>
> x = 1
> y = 4
> for char in '123+456-789*0()/.':
>     b = Button(mygui, text=char,
> command=lambda n=char:Disp(n), width=2,
> height=1)
>     b.grid(row=y, column=x, sticky=W)
>     x=x+1
>     if x==5:
>         x=1
>         y=y+1
>
> b = Button(mygui, text="^", command=lambda
> n="**":Disp(n), width=2, height=1)
> b.grid(row=8, column=2, sticky=W)
> b = Button(mygui, text="C",command=Erase,
> width=2, height=1) b.grid(row=8, column=3,
> sticky=W) b = Button(mygui,
> text="c",command=Backspace, width=2,
> height=1) b.grid(row=8, column=4,
> sticky=W) b = Button(mygui,
> text="=",command=Calc, width=18, height=1)
> b.grid(row=9, column=1, columnspan=4,
> sticky=W)
>
> mygui.mainloop()