calculator/calculator.py at main · erbibeksah/calculator · GitHub

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from tkinter import *

win = Tk()  # This is to create a basic window
win.geometry("312x324")  # this is for the size of the window
win.resizable(0, 0)  # this is to prevent from resizing the window
win.title("Calculator")

###################Starting with functions ####################
# 'btn_click' function :
# This Function continuously updates the
# input field whenever you enter a number


def btn_click(item):
    global expression
    expression = expression + str(item)
    input_text.set(expression)

# 'bt_clear' function :This is used to clear
# the input field


def bt_clear():
    global expression
    expression = ""
    input_text.set("")

# 'bt_equal':This method calculates the expression
# present in input field


def bt_equal():
    global expression
    # 'eval':This function is used to evaluates the string expression directly
    result = str(eval(expression))
    input_text.set(result)
    expression = ""


expression = ""

# 'StringVar()' :It is used to get the instance of input field

input_text = StringVar()

# Let us creating a frame for the input field

input_frame = Frame(win, width=312, height=50, bd=0,
                    highlightbackground="black", highlightcolor="black", highlightthickness=2)

input_frame.pack(side=TOP)

# Let us create a input field inside the 'Frame'

input_field = Entry(input_frame, font=('arial', 18, 'bold'),
                    textvariable=input_text, width=50, bg="#eee", bd=0, justify=RIGHT)

input_field.grid(row=0, column=0)

# 'ipady' is internal padding to increase the height of input field
input_field.pack(ipady=10)

# Let us creating another 'Frame' for the button below the 'input_frame'

btns_frame = Frame(win, width=312, height=272.5, bg="grey")

btns_frame.pack()

# first row

clear = Button(btns_frame, text="C", fg="black", width=32, height=3, bd=0, bg="#eee",
               cursor="hand2", command=lambda: bt_clear()).grid(row=0, column=0, columnspan=3, padx=1, pady=1)

divide = Button(btns_frame, text="/", fg="black", width=10, height=3, bd=0, bg="#eee",
                cursor="hand2", command=lambda: btn_click("/")).grid(row=0, column=3, padx=1, pady=1)

# second row

seven = Button(btns_frame, text="7", fg="black", width=10, height=3, bd=0, bg="#fff",
               cursor="hand2", command=lambda: btn_click(7)).grid(row=1, column=0, padx=1, pady=1)

eight = Button(btns_frame, text="8", fg="black", width=10, height=3, bd=0, bg="#fff",
               cursor="hand2", command=lambda: btn_click(8)).grid(row=1, column=1, padx=1, pady=1)

nine = Button(btns_frame, text="9", fg="black", width=10, height=3, bd=0, bg="#fff",
              cursor="hand2", command=lambda: btn_click(9)).grid(row=1, column=2, padx=1, pady=1)

multiply = Button(btns_frame, text="*", fg="black", width=10, height=3, bd=0, bg="#eee",
                  cursor="hand2", command=lambda: btn_click("*")).grid(row=1, column=3, padx=1, pady=1)

# third row

four = Button(btns_frame, text="4", fg="black", width=10, height=3, bd=0, bg="#fff",
              cursor="hand2", command=lambda: btn_click(4)).grid(row=2, column=0, padx=1, pady=1)

five = Button(btns_frame, text="5", fg="black", width=10, height=3, bd=0, bg="#fff",
              cursor="hand2", command=lambda: btn_click(5)).grid(row=2, column=1, padx=1, pady=1)

six = Button(btns_frame, text="6", fg="black", width=10, height=3, bd=0, bg="#fff",
             cursor="hand2", command=lambda: btn_click(6)).grid(row=2, column=2, padx=1, pady=1)

minus = Button(btns_frame, text="-", fg="black", width=10, height=3, bd=0, bg="#eee",
               cursor="hand2", command=lambda: btn_click("-")).grid(row=2, column=3, padx=1, pady=1)

# fourth row

one = Button(btns_frame, text="1", fg="black", width=10, height=3, bd=0, bg="#fff",
             cursor="hand2", command=lambda: btn_click(1)).grid(row=3, column=0, padx=1, pady=1)

two = Button(btns_frame, text="2", fg="black", width=10, height=3, bd=0, bg="#fff",
             cursor="hand2", command=lambda: btn_click(2)).grid(row=3, column=1, padx=1, pady=1)

three = Button(btns_frame, text="3", fg="black", width=10, height=3, bd=0, bg="#fff",
               cursor="hand2", command=lambda: btn_click(3)).grid(row=3, column=2, padx=1, pady=1)

plus = Button(btns_frame, text="+", fg="black", width=10, height=3, bd=0, bg="#eee",
              cursor="hand2", command=lambda: btn_click("+")).grid(row=3, column=3, padx=1, pady=1)

# fourth row

zero = Button(btns_frame, text="0", fg="black", width=21, height=3, bd=0, bg="#fff", cursor="hand2",
              command=lambda: btn_click(0)).grid(row=4, column=0, columnspan=2, padx=1, pady=1)

point = Button(btns_frame, text=".", fg="black", width=10, height=3, bd=0, bg="#eee",
               cursor="hand2", command=lambda: btn_click(".")).grid(row=4, column=2, padx=1, pady=1)

equals = Button(btns_frame, text="=", fg="black", width=10, height=3, bd=0, bg="#eee",
                cursor="hand2", command=lambda: bt_equal()).grid(row=4, column=3, padx=1, pady=1)

win.mainloop()