import tkinter #導(dǎo)入tkinter模塊

root = tkinter.Tk()
root.minsize(280,500)
root.title('李蛟龍的計算器')

#1.界面布局
#顯示面板
result = tkinter.StringVar()
result.set(0)              #顯示面板顯示結(jié)果1，用于顯示默認(rèn)數(shù)字0
result2 = tkinter.StringVar()      #顯示面板顯示結(jié)果2，用于顯示計算過程
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)

#數(shù)字鍵按鈕

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)

#運(yùn)算符號按鈕
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)

#操作函數(shù)
lists = []              #設(shè)置一個變量 保存運(yùn)算數(shù)字和符號的列表
isPressSign = False         #添加一個判斷是否按下運(yùn)算符號的標(biāo)志,假設(shè)默認(rèn)沒有按下按鈕
isPressNum = False
#數(shù)字函數(shù)
def pressNum(num):          #設(shè)置一個數(shù)字函數(shù) 判斷是否按下數(shù)字 并獲取數(shù)字將數(shù)字寫在顯示版上
  global lists           #全局化lists和按鈕狀態(tài)isPressSign
  global isPressSign
  if isPressSign == False:
    pass
  else:              #重新將運(yùn)算符號狀態(tài)設(shè)置為否
    result.set(0)
    isPressSign = False

  #判斷界面的數(shù)字是否為0
  oldnum = result.get()       #第一步
  if oldnum =='0':         #如過界面上數(shù)字為0 則獲取按下的數(shù)字
    result.set(num)
  else:              #如果界面上的而數(shù)字不是0 則鏈接上新按下的數(shù)字
    newnum = oldnum + num
    result.set(newnum)      #將按下的數(shù)字寫到面板中

#運(yùn)算函數(shù)
def pressCompute(sign):
  global lists
  global isPressSign
  num = result.get()       #獲取界面數(shù)字
  lists.append(num)        #保存界面獲取的數(shù)字到列表中

  lists.append(sign)       #講按下的運(yùn)算符號保存到列表中
  isPressSign = True

  if sign =='AC':        #如果按下的是'AC'按鍵，則清空列表內(nèi)容，講屏幕上的數(shù)字鍵設(shè)置為默認(rèn)數(shù)字0
    lists.clear()
    result.set(0)
  if sign =='b':         #如果按下的是退格‘'，則選取當(dāng)前數(shù)字第一位到倒數(shù)第二位
    a = num[0:-1]
    lists.clear()
    result.set(a)

#獲取運(yùn)算結(jié)果函數(shù)
def pressEqual():
  global lists
  global isPressSign

  curnum = result.get()      #設(shè)置當(dāng)前數(shù)字變量，并獲取添加到列表
  lists.append(curnum)

  computrStr = ''.join(lists)   #講列表內(nèi)容用join命令將字符串鏈接起來
  endNum = eval(computrStr)    #用eval命令運(yùn)算字符串中的內(nèi)容
#  a = str(endNum)
#  b = '='+a            #給運(yùn)算結(jié)果前添加一個 ‘=' 顯示  不過這樣寫會有BUG 不能連續(xù)運(yùn)算，這里注釋，不要 =
#  c = b[0:10]           #所有的運(yùn)算結(jié)果取9位數(shù)
  result.set(endNum)          #講運(yùn)算結(jié)果顯示到屏幕1
  result2.set(computrStr)     #將運(yùn)算過程顯示到屏幕2
  lists.clear()          #清空列表內(nèi)容

root.mainloop()