[python] 계산기 만들기 / tkinter / Calculator

 

[계산기만들기]

1. Entry 텍스트박스 grid를 총 3칸으로 구성 (columnspan=3)

2. 버튼구성

3. 버튼을 클릭해서 def 함수 호출시 lambba를 사용해서 '텍스트값'을 함수로 보냄 

(o) command = button.click  (일반 함수호출)

(x) command = button.click(1)  <- 이경우 버튼실행 안됨. 

(o) command = lambda : button.click(1) <- 사용가능

4. global 변수 선언을 통해서 return 없이 함수에 바로 사용하도록 설정

5. insert() / delete()로 텍스트박스 제어

6. math 변수를 만들어서 사칙연산 경우의 수를 if문으로 체크함

 

from tkinter import *
 
root = Tk()
root.title('계산기')
 
text = Entry(root, width=35)
text.grid(row=0, column=0, columnspan=3, padx=10, pady=10)
 
 
def button_click(number):
 
    current = text.get()
    text.delete(0, END)
    text.insert(0,str(current) + str(number))
 
def button_clear():
    text.delete(0, END)
 
def button_add():
    first_number = text.get()
    global math
    global f_num
    math = '더하기'
    f_num = int(first_number)
    text.delete(0, END)
 
def button_equal():
    second_number = text.get()
    text.delete(0, END)
 
    if math == '더하기':
        text.insert(0, f_num + int(second_number))
    if math == '빼기':
        text.insert(0, f_num - int(second_number))
    if math == '곱하기':
        text.insert(0, f_num * int(second_number))
    if math == '나누기':
        text.insert(0, f_num / int(second_number))
 
def button_subtract():
    first_number = text.get()
    global f_num
    global math
    math = '빼기'
    f_num = int(first_number)
    text.delete(0, END)
 
def button_multiply():
    first_number = text.get()
    global f_num
    global math
    math = '곱하기'
    f_num = int(first_number)
    text.delete(0, END)
 
def button_divide():
    first_number = text.get()
    global f_num
    global math
    math = '나누기'
    f_num = int(first_number)
    text.delete(0, END)
 
button_1 = Button(root, text='1', padx=40, pady=20, command=lambda : button_click(1))
button_2 = Button(root, text='2', padx=40, pady=20, command=lambda : button_click(2))
button_3 = Button(root, text='3', padx=40, pady=20, command=lambda : button_click(3))
button_4 = Button(root, text='4', padx=40, pady=20, command=lambda : button_click(4))
button_5 = Button(root, text='5', padx=40, pady=20, command=lambda : button_click(5))
button_6 = Button(root, text='6', padx=40, pady=20, command=lambda : button_click(6))
button_7 = Button(root, text='7', padx=40, pady=20, command=lambda : button_click(7))
button_8 = Button(root, text='8', padx=40, pady=20, command=lambda : button_click(8))
button_9 = Button(root, text='9', padx=40, pady=20, command=lambda : button_click(9))
button_0 = Button(root, text='0', padx=40, pady=20, command=lambda : button_click(10))
button_add = Button(root, text='+', padx=40, pady=20, command=button_add)
button_equal = Button(root, text='=', padx=87, pady=20, command=button_equal)
button_clear = Button(root, text='Clear', padx=77, pady=20, command=button_clear)
 
button_subtract = Button(root, text='-', padx=41, pady=20, command=button_subtract)
button_multiply = Button(root, text='*', padx=40, pady=20, command=button_multiply)
button_divide = Button(root, text='/', padx=40, pady=20, command=button_divide)
 
 
 
button_1.grid(row=3, column=0)
button_2.grid(row=3, column=1)
button_3.grid(row=3, column=2)
 
button_4.grid(row=2, column=0)
button_5.grid(row=2, column=1)
button_6.grid(row=2, column=2)
 
button_7.grid(row=1, column=0)
button_8.grid(row=1, column=1)
button_9.grid(row=1, column=2)
 
button_0.grid(row=4, column=0)
button_clear.grid(row=4, column=1, columnspan=2)
button_add.grid(row=5, column=0)
button_equal.grid(row=5, column=1, columnspan=2)
 
button_subtract.grid(row=6, column=0)
button_multiply.grid(row=6, column=1)
button_divide.grid(row=6, column=2)
 
root.mainloop()