import tkinter#定义计算器类
class Calc:#初始化魔术方法def __init__(self):#初始化共用属性#定义一个用于存放被计算字符串的列表self.operationList = []#定义运算标记 确定是否输入了运算符号self.isOper = False#初始化界面self.initWindows()#更改按键盘颜色方法def changeBg(self,evt):evt.widget['bg'] = 'cyan'#恢复按键盘颜色方法def backBg(self,evt):evt.widget['bg'] = 'lightgray'#数字按钮操作方法def buttonAction(self,number):#判断用户是否按下了运算按钮if self.isOper == True:#在界面上显示运算符之后的数self.num.set(number)#运算标记复位self.isOper = Falseelse:#没有铵下运算按钮#判断原始界面数字是否为0existNumber = self.num.get()if existNumber == '0':#如果界面中的初始数据为0 则获取用户输入数据并显示self.num.set(number)else:#如果界面中的初始数据不为0 则对字符进行累加self.num.set(self.num.get()+number)#运算按钮操作方法 def operation(self,opFlag):#运算标记置为真self.isOper = True#获取界面中存在的数 并且写入列表self.operationList.append(self.num.get())#当前运算符号不会在上一步中写入 需要单独写入self.operationList.append(opFlag)#获取运行结果操作方法 def getResult(self):#将当前界面中数字加入计算列表self.operationList.append(self.num.get())#开始计算 result = eval(''.join(self.operationList))self.num.set(result)#全部清空重新计算方法 def clearAll(self):#界面置0 计算列表置0self.num.set('0')self.operationList.clear()#运算标志复位self.isOper = False#实现退格键方法def backSpace(self):#获取当前显示数字长度strLength = len(self.num.get())#如果当前显示有数字if strLength > 1:#删除字串中最后一个字presentStr = self.num.get()presentStr = presentStr[:strLength - 1]self.num.set(presentStr)else:self.num.set('0')#正负号实现方法def pm(self):presentStr = self.num.get()#实现增加和去除负号if presentStr[0] == '-':self.num.set(presentStr[1:])#原始字串不得以-号和0开头elif presentStr[0] not in ('-','0'):self.num.set('-'+presentStr)#界面布局方法def initWindows(self):#生成主窗口 定制窗口尺寸root = tkinter.Tk()root.minsize(400,500)root.title('微硬计算器')#生成用于保存数值的变量self.num = tkinter.StringVar()self.num.set(0)#运算结果输出位置result = tkinter.Label(root,width=20,height=2,bg='white',bd=10,anchor='e',font=('宋体',50),textvariable=self.num)result.place(relx=0,rely=0,relwidth=1.0,relheight=0.4)###########################以下为按键部分############################buttonCE = tkinter.Button(root,text='CE',bg='lightgray',command = self.clearAll)buttonCE.place(relx=0,rely=0.4,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果buttonCE.bind('<Enter>',self.changeBg)buttonCE.bind('<Leave>',self.backBg)buttonC = tkinter.Button(root,text='C',bg='lightgray',command = self.clearAll)buttonC.place(relx=0.25,rely=0.4,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果buttonC.bind('<Enter>',self.changeBg)buttonC.bind('<Leave>',self.backBg)buttonDel = tkinter.Button(root,text='<-',bg='lightgray',command = self.backSpace)buttonDel.place(relx=0.5,rely=0.4,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果buttonDel.bind('<Enter>',self.changeBg)buttonDel.bind('<Leave>',self.backBg)buttonDiv = tkinter.Button(root,text='÷',bg='lightgray',command = lambda : self.operation('/'))buttonDiv.place(relx=0.75,rely=0.4,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果buttonDiv.bind('<Enter>',self.changeBg)buttonDiv.bind('<Leave>',self.backBg)button1 = tkinter.Button(root,text='1',bg='lightgray',command = lambda : self.buttonAction('1'))button1.place(relx=0,rely=0.5,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button1.bind('<Enter>',self.changeBg)button1.bind('<Leave>',self.backBg)button2 = tkinter.Button(root,text='2',bg='lightgray',command = lambda : self.buttonAction('2'))button2.place(relx=0.25,rely=0.5,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button2.bind('<Enter>',self.changeBg)button2.bind('<Leave>',self.backBg)button3 = tkinter.Button(root,text='3',bg='lightgray',command = lambda : self.buttonAction('3'))button3.place(relx=0.5,rely=0.5,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button3.bind('<Enter>',self.changeBg)button3.bind('<Leave>',self.backBg)buttonX = tkinter.Button(root,text='x',bg='lightgray',command = lambda : self.operation('*'))buttonX.place(relx=0.75,rely=0.5,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果buttonX.bind('<Enter>',self.changeBg)buttonX.bind('<Leave>',self.backBg)button4 = tkinter.Button(root,text='4',bg='lightgray',command = lambda : self.buttonAction('4'))button4.place(relx=0,rely=0.6,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button4.bind('<Enter>',self.changeBg)button4.bind('<Leave>',self.backBg)button5 = tkinter.Button(root,text='5',bg='lightgray',command = lambda : self.buttonAction('5'))button5.place(relx=0.25,rely=0.6,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button5.bind('<Enter>',self.changeBg)button5.bind('<Leave>',self.backBg)button6 = tkinter.Button(root,text='6',bg='lightgray',command = lambda : self.buttonAction('6'))button6.place(relx=0.5,rely=0.6,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button6.bind('<Enter>',self.changeBg)button6.bind('<Leave>',self.backBg)button_ = tkinter.Button(root,text='-',bg='lightgray',command = lambda : self.operation('-'))button_.place(relx=0.75,rely=0.6,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button_.bind('<Enter>',self.changeBg)button_.bind('<Leave>',self.backBg)button7 = tkinter.Button(root,text='7',bg='lightgray',command = lambda : self.buttonAction('7'))button7.place(relx=0,rely=0.7,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button7.bind('<Enter>',self.changeBg)button7.bind('<Leave>',self.backBg)button8 = tkinter.Button(root,text='8',bg='lightgray',command = lambda : self.buttonAction('8'))button8.place(relx=0.25,rely=0.7,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button8.bind('<Enter>',self.changeBg)button8.bind('<Leave>',self.backBg)button9 = tkinter.Button(root,text='9',bg='lightgray',command = lambda : self.buttonAction('9'))button9.place(relx=0.5,rely=0.7,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button9.bind('<Enter>',self.changeBg)button9.bind('<Leave>',self.backBg)buttonAdd = tkinter.Button(root,text='+',bg='lightgray',command = lambda : self.operation('+'))buttonAdd.place(relx=0.75,rely=0.7,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果buttonAdd.bind('<Enter>',self.changeBg)buttonAdd.bind('<Leave>',self.backBg)buttonFlag = tkinter.Button(root,text='±',bg='lightgray',command = self.pm)buttonFlag.place(relx=0,rely=0.8,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果buttonFlag.bind('<Enter>',self.changeBg)buttonFlag.bind('<Leave>',self.backBg)button0 = tkinter.Button(root,text='0',bg='lightgray',command = lambda : self.buttonAction('0'))button0.place(relx=0.25,rely=0.8,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果button0.bind('<Enter>',self.changeBg)button0.bind('<Leave>',self.backBg)buttonPoint = tkinter.Button(root,text='.',bg='lightgray',command = lambda : self.buttonAction('.'))buttonPoint.place(relx=0.5,rely=0.8,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果buttonPoint.bind('<Enter>',self.changeBg)buttonPoint.bind('<Leave>',self.backBg)buttonEque = tkinter.Button(root,text='=',bg='lightgray',command = self.getResult)buttonEque.place(relx=0.75,rely=0.8,relwidth=0.25,relheight=0.1)#绑定按钮 生成鼠标经过变色效果buttonEque.bind('<Enter>',self.changeBg)buttonEque.bind('<Leave>',self.backBg)#########################以上为按键部分#############################底部显示信息bottomLabel = tkinter.Label(root,text = 'Power By Microhard Corpration\n@2017',bg='cyan',width=30,height = 1,padx=0)bottomLabel.place(relx=0,rely=0.9,relwidth=1.0,relheight=0.1)#主窗口循环root.mainloop()#实例化计算器对象
c = Calc()