Tkinter grid autosize help

[Terry Reedy]

On 8/2/2014 6:53 PM, Nicholas Cannon wrote:
> On Saturday, August 2, 2014 10:38:28 PM UTC+8, Nicholas Cannon wrote:
>> So i have a basic calculator program and i have a label that i want to go across
 >> the top to show the numbers and stuff like on a normal calculator.

The buttons are labelled already with numbers. Whatever stuff you meant,
is not diplayed.

>> The only way i can make the buttons look neat and then when i keep
 >>  pressing one the label gets larger and then half the buttons
 >>  move out of the screen.

Since nothing gets bigger, I have no idea what you mean.

 >> I cant seem to fix this i have tried columnspan, columnconfigure
>> and heaps of other stuff and non works it always expands.
 >> is there a way i can stop the grid from expanding?

If I shrink the window horizontally, the minimun size is 3 columns.
If I shrink vertically, bottom buttons disappear.  I am not sure why.

> ok here is the code:

Only some of it.

from tkinter import *

def add(*args): print(args)

> #window setup
> main = Tk()
> main.title('Calculator')
> main.geometry('300x350')
> main.resizable()
>
> app = Frame(main)
> app.grid()
> app.columnconfigure(0, weight=500)
> app.columnconfigure(1, weight=500)

You left out column 2.

>
> #number view label
> number = ' '
> numberView = Label(app, text= number)
> numberView.grid(row=0, column=0, columnspan=100)

What you need for a changing label is

number = StringVar()
number.set('')
numberView = Label(app, textvariable=number)

but see below

> #Num Pad Buttons below
> num1 = '1'
> button1 = Button(app, text='1', command= lambda: add(num1), width=5)
> button1.grid(row=1, column=0)

You are using the braindead telephone keypad layout.
Calculators and number keypads have the more sensible layout
7 8 9
4 5 6
1 2 3
0


> num2 = '2'
> button1 = Button(app, text='2', command= lambda: add(num2), width=5)
> button1.grid(row=1, column=1)
>
> num3 = '3'
> button1 = Button(app, text='3', command= lambda: add(num3), width=5)
> button1.grid(row=1, column=2)
>
> num4 = '4'
> button1 = Button(app, text='4', command= lambda: add(num4), width=5)
> button1.grid(row=2, column=0)
>
> num5 = '5'
> button1 = Button(app, text='5', command= lambda: add(num5), width=5)
> button1.grid(row=2, column=1)
>
> num6 = '6'
> button1 = Button(app, text='6', command= lambda: add(num6), width=5)
> button1.grid(row=2, column=2)
>
> num7 = '7'
> button1 = Button(app, text='7', command= lambda: add(num7), width=5)
> button1.grid(row=3, column=0)
>
> num8 = '8'
> button1 = Button(app, text='8', command= lambda: add(num8), width=5)
> button1.grid(row=3, column=1)
>
> num9 = '9'
> button1 = Button(app, text='9', command= lambda: add(num9), width=5)
> button1.grid(row=3, column=2)
>
> num0 = '0'
> button1 = Button(app, text='0', command= lambda: add(num0), width=5)
> button1.grid(row=4, column=1)
)
>

This sort of repetitious code is crying for a loop. For one thing, if 
you want to change the buttons, there should only be one Button call to 
modify. Since I am still learning to write tkinter myself, I wrote the 
following, which I suspect does what you wanted and a bit more.

from tkinter import *

main = Tk()
main.title('Calculator')
main.geometry('300x350')
#main.resizable()  # does nothing

app = Frame(main)
app.grid()

total = IntVar()
total.set(0)
entry = StringVar()
entry.set('')

Label(app, text='Total').grid(row=0, column=0)
Label(app, textvariable=total).grid(row=0, column=1, columnspan=3)
Label(app, text='Entry').grid(row=1, column=0)
Label(app, textvariable=entry).grid(row=1, column=1, columnspan=3)

def append(digit):
     entry.set(entry.get() + digit)

def add():
     total.set(total.get() + int(entry.get()))
     entry.set('')
def sub():
     total.set(total.get() - int(entry.get()))
     entry.set('')

header_rows = 2
for num, r, c in (
         ('7', 0, 0), ('8', 0, 1), ('9', 0, 2),
         ('4', 1, 0), ('5', 1, 1), ('6', 1, 2),
         ('1', 2, 0), ('2', 2, 1), ('3', 2, 2),
         ('0', 3, 0), ('+', 3, 1), ('-', 3, 2),):
     cmd = {'+':add, '-':sub}.get(num, lambda num=num: append(num))
     b = Button(app, text=num, command=cmd, width=5)
     b.grid(row=header_rows+r, column=c)

main.mainloop()




-- 
Terry Jan Reedy