Question

write a small atm bank interface using python gui wxpython like a calculator buttons which chance the panel after login to another screen or panel just like the tinker one but in wxpython

Answer 1

from tkinter import *

  

# globally declare the expression variable

expression = ""

  

  

# Function to update expressiom

# in the text entry box

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)

  

  

# Function to evaluate the final 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)

  

        # initialze the expression variable

        # by empty string

        expression = ""

  

    # if error is generate then handle

    # by the except block

    except:

  

        equation.set(" error ")

        expression = ""

  

  

# Function to clear the contents

# of text entry box

def clear():

    global expression

    expression = ""

    equation.set("")

  

  

# Driver code

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("265x125")

  

    # 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)

  

    equation.set('enter your expression')

  

    # 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')

  

    # start the GUI

    gui.mainloop()

I was given command line for easier understand of yours.

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