Tkinter. How do i show a value of a code to the user after he presses a button???

Question

i did a code to do some mat calculation . the user enters 2 values and then he presses button . the code will take that 2 values do some math and return a result . how do i show that result to the user ?

Answer 1

When creating your tk.Button() object pass in command=func_name and in that function update your labels text. Or in the button.config()

from tkinter import *

bye = 'Goodbye'

def update_text():
label.config(text=bye)

root = Tk()
root.title("My Title")
label = Label(root, text="Hello")
label.pack()
button = Button(root, text="Click Me", width=30, command=update_text)
button.pack()
root.mainloop()

Answer 2

ah I see.. when I do that, I use a label.. I set the text of the label to a variable and when the button is pressed I update that variable, thus updating the label on screen

Answer 3

import math
from Tkinter import*
def circle_weight ():
area =math.pi*int (ent1.get ())**2
weight = area *int (ent2.get ())
print weight
master =Tk ()
master.title ("Disc weight calculator")
master.geometry ("300x300")
master.wm_iconbitmap ('steel-alloy.ico')
lbl1=Label (master,text="radius",bg="cornsilk")
ent1=Entry(master)
lbl1.pack ()
ent1.pack ()
lbl2=Label (master,text="thk")
ent2=Entry (master)
lbl2.pack ()
ent2.pack ()
btn=Button(master,text=Calculate",command=circle_weight)
btn.pack ()
var=StringVar ()
lbl3=Label (master,textvariable=var)
var.set (circle_weight)
lbl3.pack ()
master.mainloop ()

that is my code still not running . sorry i am dump :)

Answer 4

import math
from tkinter import *

def circle_weight():
area = math.pi * int(ent1.get()) ** 2
weight = area * int(ent2.get())
var.set(weight)

master = Tk()
master.title("Disc weight calculator")
master.geometry("300x300")
master.wm_iconbitmap('steel-alloy.ico')

lbl1 = Label(master, text="radius", bg="cornsilk")
lbl1.pack()

ent1 = Entry(master)
ent1.pack()

lbl2 = Label(master, text="thk")
lbl2.pack()

ent2 = Entry(master)
ent2.pack()

btn = Button(master, text="Calculate", command=circle_weight)
btn.pack()

var = StringVar()
var.set("Output") # <-- Set to the initial String that you want the label to have

lbl3 = Label(master, textvariable=var)
lbl3.pack()
master.mainloop()

You just have a couple of typos. Your missing a " for your button text -> Calculate" and the next line you have dtn instead of btn. And add a space between import and *.
Note this is for python 3.5 and organized for readability.
python 3.5 import is tkinter for 2.7 Tkinter

Answer 5

sorry forgot to mention . i want to do that in tkinter

Answer 6

lbl3=Label (master,textvariable=??????)
lbl3.pack ()
if this what you mean . so i dont know what to put in the question mark place. the calculation is been made under def .....() but when i call the def name it return nothing.

Answer 7

sorry i am just a baby in coding

Answer 8

you are amazing guys . it is working ,it is working , yes yes yes . thanks alot