How To Get Value From Entry (tkinter), Use It In Formula And Print The Result It In Label

When using the function entry of Tkinter, you can write a string value and do things with it; but I'm actually working with formulas. The idea is fairly simple: to put a bunch of b

Solution 1:

You can either get values by .get() from widgets

from tkinter import *
#Create the window
myWindow = Tk()

#Define your formula here
def MyCalculateFunction():

    #Get your valuefrom box_pressure
    #Remember toconvert string tointegerorfloat/double
    pressure, temprature =float(box_pressure.get()), float(box_temprature.get())
    result= pressure + temprature

    #Show your resultwith label
    label_result.config(text="%f + %f = %f" % (pressure, temprature, result))

#Create a input box for pressure
box_pressure = Entry(myWindow)
box_pressure.pack()

#Create a input box for temprature
box_temprature = Entry(myWindow)
box_temprature.pack()

#Create a button
button_calculate = Button(myWindow, text="Calcuate", command=MyCalculateFunction)
button_calculate.pack()

#Create a label
label_result = Label(myWindow)
label_result.pack()

or get it from textvariable

#Bind it with variable
variable_pressure = DoubleVar()
box_pressure = Entry(myWindow, textvariable=variable_pressure)
box_pressure.pack()

#Get/Set value by .get() / .set()
variable_pressure.set(42)

# shows 42
print(variable_pressure.get())