import tkinter #匯入tkinter模組

root = tkinter.Tk()

root.minsize(280,500)

root.title('計算器')

#1.介面佈局

#顯示面板

result = tkinter.StringVar()

result.set(0) #顯示面板顯示結果1，用於顯示預設數字0

result2 = tkinter.StringVar() #顯示面板顯示結果2，用於顯示計算過程

result2.set('')

#顯示版

label = tkinter.Label(root,font = ('微軟雅黑',20),bg = '#EEE9E9',bd ='9',fg = '#828282',anchor = 'se',textvariable = result2)

label.place(width = 280,height = 170)

label2 = tkinter.Label(root,font = ('微軟雅黑',30),bg = '#EEE9E9',bd ='9',fg = 'black',anchor = 'se',textvariable = result)

label2.place(y = 170,width = 280,height = 60)

btn7 = tkinter.Button(root,text = '7',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('7'))

btn7.place(x = 0,y = 285,width = 70,height = 55)

btn8 = tkinter.Button(root,text = '8',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('8'))

btn8.place(x = 70,y = 285,width = 70,height = 55)

btn9 = tkinter.Button(root,text = '9',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('9'))

btn9.place(x = 140,y = 285,width = 70,height = 55)

btn4 = tkinter.Button(root,text = '4',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('4'))

btn4.place(x = 0,y = 340,width = 70,height = 55)

btn5 = tkinter.Button(root,text = '5',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('5'))

btn5.place(x = 70,y = 340,width = 70,height = 55)

btn6 = tkinter.Button(root,text = '6',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('6'))

btn6.place(x = 140,y = 340,width = 70,height = 55)

btn1 = tkinter.Button(root,text = '1',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('1'))

btn1.place(x = 0,y = 395,width = 70,height = 55)

btn2 = tkinter.Button(root,text = '2',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('2'))

btn2.place(x = 70,y = 395,width = 70,height = 55)

btn3 = tkinter.Button(root,text = '3',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('3'))

btn3.place(x = 140,y = 395,width = 70,height = 55)

btn0 = tkinter.Button(root,text = '0',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum('0'))

btn0.place(x = 70,y = 450,width = 70,height = 55)

btnac = tkinter.Button(root,text = 'AC',bd = 0.5,font = ('黑體',20),fg = 'orange',command = lambda :pressCompute('AC'))

btnac.place(x = 0,y = 230,width = 70,height = 55)

btnback = tkinter.Button(root,text = '←',font = ('微軟雅黑',20),fg = '#4F4F4F',bd = 0.5,command = lambda:pressCompute('b'))

btnback.place(x = 70,y = 230,width = 70,height = 55)

btndivi = tkinter.Button(root,text = '÷',font = ('微軟雅黑',20),fg = '#4F4F4F',bd = 0.5,command = lambda:pressCompute('/'))

btndivi.place(x = 140,y = 230,width = 70,height = 55)

btnmul = tkinter.Button(root,text ='×',font = ('微軟雅黑',20),fg = "#4F4F4F",bd = 0.5,command = lambda:pressCompute('*'))

btnmul.place(x = 210,y = 230,width = 70,height = 55)

btnsub = tkinter.Button(root,text = '-',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda:pressCompute('-'))

btnsub.place(x = 210,y = 285,width = 70,height = 55)

btnadd = tkinter.Button(root,text = '+',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda:pressCompute('+'))

btnadd.place(x = 210,y = 340,width = 70,height = 55)

btnequ = tkinter.Button(root,text = '=',bg = 'orange',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda :pressEqual())

btnequ.place(x = 210,y = 395,width = 70,height = 110)

btnper = tkinter.Button(root,text = '%',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda:pressCompute('%'))

btnper.place(x = 0,y = 450,width = 70,height = 55)

btnpoint = tkinter.Button(root,text = '.',font = ('微軟雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda:pressCompute('.'))

btnpoint.place(x = 140,y = 450,width = 70,height = 55)

#操作函式

lists = [] #設定一個變數 儲存運算數字和符號的列表

isPressNum = False

#數字函式

def pressNum(num): #設定一個數字函式 判斷是否按下數字 並獲取數字將數字寫在顯示版上

global isPressSign

if isPressSign == False:

pass

else: #重新將運算子號狀態設定為否

result.set(0)

isPressSign = False

#判斷介面的數字是否為0

oldnum = result.get() #第一步

if oldnum =='0': #如過介面上數字為0 則獲取按下的數字

result.set(num)

else: #如果介面上的而數字不是0 則連結上新按下的數字

newnum = oldnum + num

result.set(newnum) #將按下的數字寫到面板中

#運算函式

def pressCompute(sign):

global lists

global isPressSign

num = result.get() #獲取介面數字

lists.append(num) #儲存介面獲取的數字到列表中

lists.append(sign) #講按下的運算子號儲存到列表中

isPressSign = True

if sign =='AC': #如果按下的是'AC'按鍵，則清空列表內容，講螢幕上的數字鍵設定為預設數字0

lists.clear()

result.set(0)

if sign =='b': #如果按下的是退格''，則選取當前數字第一位到倒數第二位

a = num[0:-1]

lists.clear()

result.set(a)

#獲取運算結果函式

def pressEqual():

global lists

global isPressSign

curnum = result.get() #設定當前數字變數，並獲取新增到列表

lists.append(curnum)

computrStr = ''.join(lists) #講列表內容用join命令將字串連結起來

endNum = eval(computrStr) #用eval命令運算字串中的內容

# a = str(endNum)

# b = '='+a #給運算結果前新增一個 '=' 顯示 不過這樣寫會有BUG 不能連續運算，這裡註釋，不要 =

# c = b[0:10] #所有的運算結果取9位數

result.set(endNum) #講運算結果顯示到螢幕1

result2.set(computrStr) #將運算過程顯示到螢幕2

lists.clear() #清空列表內容

root.mainloop()