A small python program that creates a calculator app
Prerequisites:
- Python 3
Run Code:
python calculator.py
Code language: CSS (css)
Source Code:
from tkinter import Tk, END, Entry, N, E, S, W, Button from tkinter import font from tkinter import Label from functools import partial def get_input(entry, argu): entry.insert(END, argu) def backspace(entry): input_len = len(entry.get()) entry.delete(input_len - 1) def clear(entry): entry.delete(0, END) def calc(entry): input_info = entry.get() try: output = str(eval(input_info.strip())) except ZeroDivisionError: popupmsg() output = "" clear(entry) entry.insert(END, output) def popupmsg(): popup = Tk() popup.resizable(0, 0) popup.geometry("120x100") popup.title("Alert") label = Label(popup, text="Cannot divide by 0 ! \n Enter valid values") label.pack(side="top", fill="x", pady=10) B1 = Button(popup, text="Okay", bg="#DDDDDD", command=popup.destroy) B1.pack() def cal(): root = Tk() root.title("Calc") root.resizable(0, 0) entry_font = font.Font(size=15) entry = Entry(root, justify="right", font=entry_font) entry.grid(row=0, column=0, columnspan=4, sticky=N + W + S + E, padx=5, pady=5) cal_button_bg = '#FF6600' num_button_bg = '#4B4B4B' other_button_bg = '#DDDDDD' text_fg = '#FFFFFF' button_active_bg = '#C0C0C0' num_button = partial(Button, root, fg=text_fg, bg=num_button_bg, padx=10, pady=3, activebackground=button_active_bg) cal_button = partial(Button, root, fg=text_fg, bg=cal_button_bg, padx=10, pady=3, activebackground=button_active_bg) button7 = num_button(text='7', bg=num_button_bg, command=lambda: get_input(entry, '7')) button7.grid(row=2, column=0, pady=5) button8 = num_button(text='8', command=lambda: get_input(entry, '8')) button8.grid(row=2, column=1, pady=5) button9 = num_button(text='9', command=lambda: get_input(entry, '9')) button9.grid(row=2, column=2, pady=5) button10 = cal_button(text='+', command=lambda: get_input(entry, '+')) button10.grid(row=4, column=3, pady=5) button4 = num_button(text='4', command=lambda: get_input(entry, '4')) button4.grid(row=3, column=0, pady=5) button5 = num_button(text='5', command=lambda: get_input(entry, '5')) button5.grid(row=3, column=1, pady=5) button6 = num_button(text='6', command=lambda: get_input(entry, '6')) button6.grid(row=3, column=2, pady=5) button11 = cal_button(text='-', command=lambda: get_input(entry, '-')) button11.grid(row=3, column=3, pady=5) button1 = num_button(text='1', command=lambda: get_input(entry, '1')) button1.grid(row=4, column=0, pady=5) button2 = num_button(text='2', command=lambda: get_input(entry, '2')) button2.grid(row=4, column=1, pady=5) button3 = num_button(text='3', command=lambda: get_input(entry, '3')) button3.grid(row=4, column=2, pady=5) button12 = cal_button(text='*', command=lambda: get_input(entry, '*')) button12.grid(row=2, column=3, pady=5) button0 = num_button(text='0', command=lambda: get_input(entry, '0')) #button0.grid(row=5, column=0, columnspan=2, padx=3, pady=5, sticky=N + S + E + W) button0.grid(row=5, column=0, pady=5) button13 = num_button(text='.', command=lambda: get_input(entry, '.')) button13.grid(row=5, column=1, pady=5) button14 = Button(root, text='/', fg=text_fg, bg=cal_button_bg, padx=10, pady=3, command=lambda: get_input(entry, '/')) button14.grid(row=1, column=3, pady=5) button15 = Button(root, text='<-', bg=other_button_bg, padx=10, pady=3, command=lambda: backspace(entry), activebackground=button_active_bg) button15.grid(row=1, column=0, columnspan=2, padx=3, pady=5, sticky=N + S + E + W) button16 = Button(root, text='C', bg=other_button_bg, padx=10, pady=3, command=lambda: clear(entry), activebackground=button_active_bg) button16.grid(row=1, column=2, pady=5) button17 = Button(root, text='=', fg=text_fg, bg=cal_button_bg, padx=10, pady=3, command=lambda: calc(entry), activebackground=button_active_bg) button17.grid(row=5, column=3, pady=5) button18 = Button(root, text='^', fg=text_fg, bg=cal_button_bg, padx=10, pady=3, command=lambda: get_input(entry, '**')) button18.grid(row=5, column=2, pady=5) root.mainloop() if __name__ == '__main__': cal()
Output:
