Welcome folks today in this blog post we will be building a basic simple arithmetic calculator in tkinter using python. All the full source code of the application is shown below.
Get Started
In order to get started you need to install the following library using the pip command as shown below
pip install tkinter
After installing make an app.py file and copy paste the following code
app.py
|
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 |
import tkinter as tk calc = tk.Tk() calc.title("CrappyCalc") buttons = [ '7', '8', '9', '*', 'C', '4', '5', '6', '/', 'Neg', '1', '2', '3', '-', '$', '0', '.', '=', '+', '@' ] # set up GUI row = 1 col = 0 for i in buttons: button_style = 'raised' action = lambda x = i: click_event(x) tk.Button(calc, text = i, width = 7, height = 7, relief = button_style, command = action) \ .grid(row = row, column = col, sticky = 'nesw', ) col += 1 if col > 4: col = 0 row += 1 display = tk.Entry(calc, width = 40, bg = "white") display.grid(row = 0, column = 0, columnspan = 5) def click_event(key): # = -> calculate results if key == '=': # safeguard against integer division if '/' in display.get() and '.' not in display.get(): display.insert(tk.END, ".0") # attempt to evaluate results try: result = eval(display.get()) display.insert(tk.END, " = " + str(result)) except: display.insert(tk.END, " Error, use only valid chars") # C -> clear display elif key == 'C': display.delete(0, tk.END) # $ -> clear display elif key == '$': display.delete(0, tk.END) display.insert(tk.END, "$$$$C.$R.$E.$A.$M.$$$$") # @ -> clear display elif key == '@': display.delete(0, tk.END) display.insert(tk.END, "wwwwwwwwwwwwwwwwebsite") # neg -> negate term elif key == 'neg': if '=' in display.get(): display.delete(0, tk.END) try: if display.get()[0] == '-': display.delete(0) else: display.insert(0, '-') except IndexError: pass # clear display and start new input else: if '=' in display.get(): display.delete(0, tk.END) display.insert(tk.END, key) # RUNTIME calc.mainloop() |
Now if you execute the above python script by using the below command as shown below
python app.py
