calculator GUI added

Author: Nishant2907

tkinter-calculator.py

@@ -0,0 +1,133 @@
+# -*- coding: utf-8 -*-
+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()