함수까지 구현된 계산기 코드의 객체지향 코드입니다.
# Step-2 => OOP rewriting
from tkinter import *
from tkinter import ttk
class Calculator:
# 연산자 값 저장.
operation = ''
# 연산자 앞에 입력한수 임시저장.
temp_number = 0
#결과출력 상태 저장.
answer_trigger = False
def button_pressed(self, value):
#함수형 코드에서는 함수 바깥의 변수를 global로 재선언해야했으나,
# 객체형 코드에서는 self.
if value=='AC':
self.number_entry.delete(0,'end')
self.operation = ''
self.answer_trigger = False
print("AC pressed")
else:
#숫자를 눌렀을때 결과출력상태가 TRUE이면, 지우고 새로 입력.
if self.answer_trigger:
self.number_entry.delete(0,"end")
self.answer_trigger = False
self.number_entry.insert("end",value)
print(value,"pressed")
# 연산결과 float형 처리.
def float_filter(self, value):
try:
int(value)
return int(value)
except ValueError:
return float(value)
# 소수점이하 없을때는 정수형으로.
def int_changer(self, value):
if int(value) == float(value):
return int(value)
else:
return float(value)
def math_button_pressed(self, value):
if not self.number_entry.get() == '':
self.operation = value
self.temp_number = self.float_filter(self.number_entry.get())
self.number_entry.delete(0,'end')
print(self.temp_number,self.operation)
def equal_button_pressed(self):
if not (self.operation =='' and self.number_entry.get()==''):
number = int(self.number_entry.get())
if self.operation == '/':
solution = self.temp_number/number
elif self.operation == '*':
solution = self.temp_number*number
elif self.operation == '+':
solution = self.temp_number+number
else :
solution = self.temp_number-number
solution = self.int_changer(solution)
self.number_entry.delete(0,'end')
self.number_entry.insert(0,solution)
print(self.temp_number,self.operation,number,"=",solution)
self.operation = ''
self.temp_number = 0
#계산후 결과출력 상태를 True 로 변경.
self.answer_trigger = True
def __init__(self, root):
root.title("Calculator")
root.geometry("300x200")
self.entry_value = StringVar(root, value='')
self.number_entry = ttk.Entry(root, textvariable = self.entry_value, width=20)
self.number_entry.grid(row=0, columnspan=3)
self.button7 = ttk.Button(root, text="7", command = lambda:self.button_pressed('7'))
self.button7.grid(row=1, column=0)
self.button8 = ttk.Button(root, text="8", command = lambda:self.button_pressed('8'))
self.button8.grid(row=1, column=1)
self.button9 = ttk.Button(root, text="9", command = lambda:self.button_pressed('9'))
self.button9.grid(row=1, column=2)
self.button_div = ttk.Button(root, text="/", command = lambda:self.math_button_pressed('/'))
self.button_div.grid(row=1, column=3)
self.button4 = ttk.Button(root, text="4", command = lambda:self.button_pressed('4'))
self.button4.grid(row=2, column=0)
self.button5 = ttk.Button(root, text="5", command = lambda:self.button_pressed('5'))
self.button5.grid(row=2, column=1)
self.button6 = ttk.Button(root, text="6", command = lambda:self.button_pressed('6'))
self.button6.grid(row=2, column=2)
self.button_mult = ttk.Button(root, text="*", command = lambda:self.math_button_pressed('*'))
self.button_mult.grid(row=2, column=3)
self.button1 = ttk.Button(root, text="1", command = lambda:self.button_pressed('1'))
self.button1.grid(row=3, column=0)
self.button2 = ttk.Button(root, text="2", command = lambda:self.button_pressed('2'))
self.button2.grid(row=3, column=1)
self.button3 = ttk.Button(root, text="3", command = lambda:self.button_pressed('3'))
self.button3.grid(row=3, column=2)
self.button_add = ttk.Button(root, text="+", command = lambda:self.math_button_pressed('+'))
self.button_add.grid(row=3, column=3)
self.button_ac = ttk.Button(root, text="AC", command = lambda:self.button_pressed('AC'))
self.button_ac.grid(row=4, column=0)
self.button0 = ttk.Button(root, text="0", command = lambda:self.button_pressed('0'))
self.button0.grid(row=4, column=1)
self.button_equal = ttk.Button(root, text="=", command = lambda:self.equal_button_pressed())
self.button_equal.grid(row=4, column=2)
self.button_sub = ttk.Button(root, text="-", command = lambda:self.math_button_pressed('-'))
self.button_sub.grid(row=4, column=3)
root = Tk()
calc = Calculator(root)
root.mainloop()
