Tkinter, add pressed buttons onto string display string, how to?

7stud bbxx789_05ss at yahoo.com
Sat Apr 5 21:56:25 CEST 2008


On Apr 5, 1:55 pm, 7stud <bbxx789_0... at yahoo.com> wrote:
> skanem... at yahoo.se wrote:
> > using tkinter and python i now have a small App (that will hopefully
> > soon be a fully functioning calculator) where u can push buttons and
> > the corresponding number or operator is shown.
>
> > when u press 1, "1" appears on the screen, pres + and "+" appears etc.
>
> > at the moment every output overwrites the previous so what i want to
> > do is obviosuly to add every new output to a string so that i can read
> > the string and perform the calculation.
>
> > so i want:
> > *  when pushing the button push the token of the button onto a string
> > * display the new string, ie "1+2" for example
> > * want to be able to access this string when pressing calculate so i
> > can figure out which operators should
> > be done first so it can solve something like this: "(1+2*3)(3-4/2)"
> > and not just simple "1+2"-stuff.
>
> > do i have to have some global string-variable in the GUIframework
> > then? im not sure where to start...
>
> input = "hello"
> input += " world"
> print input
>
> --output:--
> hello
>
> A caculator program is pretty complex.  Based on your rudimentary
> questions, I don't think you have enough programming experience to
> tackle a project like that yet.

--output:--
hello world



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