Talk:Tkinter

from tkinter import * expression = "" def press(num): # point out the global expression variable global expression # concatenation of string expression = expression + str(num) # update the expression by using set method equation.set(expression) def equalpress: # Try and except statement is used # for handling the errors like zero # division error etc.   # Put that code inside the try block # which may generate the error try: global expression # eval function evaluate the expression # and str function convert the result # into string total = str(eval(expression)) equation.set(total) # initialize the expression variable # by empty string expression = "" # if error is generate then handle # by the except block except: equation.set(" error ") expression = "" def clear: global expression expression = "" equation.set("") if __name__ == "__main__": # create a GUI window gui = Tk # set the background colour of GUI window gui.configure(background="light green") # set the title of GUI window gui.title("Simple Calculator") # set the configuration of GUI window gui.geometry("270x150") # StringVar is the variable class # we create an instance of this class equation = StringVar # create the text entry box for # showing the expression. expression_field = Entry(gui, textvariable=equation) # grid method is used for placing # the widgets at respective positions # in table like structure. expression_field.grid(columnspan=4, ipadx=70) # create a Buttons and place at a particular # location inside the root window. # when user press the button, the command or   # function affiliated to that button is executed. button1 = Button(gui, text=' 1 ', fg='black', bg='red',                   command=lambda: press(1), height=1, width=7) button1.grid(row=2, column=0) button2 = Button(gui, text=' 2 ', fg='black', bg='red',                   command=lambda: press(2), height=1, width=7) button2.grid(row=2, column=1) button3 = Button(gui, text=' 3 ', fg='black', bg='red',                   command=lambda: press(3), height=1, width=7) button3.grid(row=2, column=2) button4 = Button(gui, text=' 4 ', fg='black', bg='red',                   command=lambda: press(4), height=1, width=7) button4.grid(row=3, column=0) button5 = Button(gui, text=' 5 ', fg='black', bg='red',                   command=lambda: press(5), height=1, width=7) button5.grid(row=3, column=1) button6 = Button(gui, text=' 6 ', fg='black', bg='red',                   command=lambda: press(6), height=1, width=7) button6.grid(row=3, column=2) button7 = Button(gui, text=' 7 ', fg='black', bg='red',                   command=lambda: press(7), height=1, width=7) button7.grid(row=4, column=0) button8 = Button(gui, text=' 8 ', fg='black', bg='red',                   command=lambda: press(8), height=1, width=7) button8.grid(row=4, column=1) button9 = Button(gui, text=' 9 ', fg='black', bg='red',                   command=lambda: press(9), height=1, width=7) button9.grid(row=4, column=2) button0 = Button(gui, text=' 0 ', fg='black', bg='red',                   command=lambda: press(0), height=1, width=7) button0.grid(row=5, column=0) plus = Button(gui, text=' + ', fg='black', bg='red',               command=lambda: press("+"), height=1, width=7) plus.grid(row=2, column=3) minus = Button(gui, text=' - ', fg='black', bg='red',               command=lambda: press("-"), height=1, width=7) minus.grid(row=3, column=3) multiply = Button(gui, text=' * ', fg='black', bg='red',                   command=lambda: press("*"), height=1, width=7) multiply.grid(row=4, column=3) divide = Button(gui, text=' / ', fg='black', bg='red',                   command=lambda: press("/"), height=1, width=7) divide.grid(row=5, column=3) equal = Button(gui, text=' = ', fg='black', bg='red',               command=equalpress, height=1, width=7) equal.grid(row=5, column=2) clear = Button(gui, text='Clear', fg='black', bg='red',               command=clear, height=1, width=7) clear.grid(row=5, column='1') Decimal= Button(gui, text='.', fg='black', bg='red',                   command=lambda: press('.'), height=1, width=7) Decimal.grid(row=6, column=0) # start the GUI gui.mainloop
 * 1) Python program to create a simple GUI
 * 2) calculator using Tkinter
 * 1) import everything from tkinter module
 * 1) globally declare the expression variable
 * 1) Function to update expression
 * 2) in the text entry box
 * 1) Function to evaluate the final expression
 * 1) Function to clear the contents
 * 2) of text entry box
 * 1) Driver code

Simpler Example
I suggest that the example under A minimal application should be made more simpler and it should be changed to a Hello, world! example. Thoughts? --I8086 (talk) 12:49, 13 March 2015 (UTC)


 * I agree and disagree. This should be the second example and a simple Hello, world! example with out the need for a class structure should be the first. I think there are many other issues and concepts that need to be introduced. To be of practical use we need a menubar structure, and canvas too. --ClemRutter (talk) 17:47, 16 August 2018 (UTC)

Is Tkinter still the de facto Python GUI?
In 2021, there are a lot of different libraries to write GUIs, among them GTK and Qt. Should the introductory sentence be edited? 2601:281:C500:37:5D60:623F:7A0F:F317 (talk) 00:27, 17 March 2021 (UTC)