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  • 面向对象简易计算器

    import tkinter
    import math
    import tkinter.messagebox

    class jsq:


    #界面布局方法
    def __init__(self):
    #创建界面
    self.root = tkinter.Tk()
    self.root.minsize(280,420)
    self.root.title('chy计算器')
    #调用方法
    self.showlabel()
    self.myfunc()
    self.root.resizable(width = False, height = False)

    self.root.mainloop()


    def myfunc(self):
    print('执行操作')

    #添加菜单
    #创建总菜单
    allmenu = tkinter.Menu(self.root)
    #创建查看菜单
    filemenu= tkinter.Menu(allmenu,tearoff=0)
    #添加查看子菜单
    filemenu.add_command(label='标准型(T) Alt+1',command = self.myfunc)
    filemenu.add_command(label='科学型(S) Alt+2',command = self.myfunc)
    filemenu.add_command(label='程序员(P) Alt+3',command = self.myfunc)
    filemenu.add_command(label='统计信息(A) Alt+4',command = self.myfunc)
    #分割线
    filemenu.add_separator()
    filemenu.add_command(label='历史记录(Y) Ctrl+H',command = self.myfunc)
    filemenu.add_command(label='数字分组(I)',command = self.myfunc)
    #分割线
    filemenu.add_separator()
    filemenu.add_command(label='基本(B) Ctrl+F',command = self.myfunc)
    filemenu.add_command(label='单位转换(U) Ctrl+U',command = self.myfunc)
    filemenu.add_command(label='日期计算(D) Ctrl+E',command = self.myfunc)
    #分割线
    filemen= tkinter.Menu(allmenu,tearoff=0)
    filemenu.add_cascade(label='工作表(W)',menu =filemen)
    #创建工作表下的子菜单
    filemen.add_command(label='抵押(M)',command = self.myfunc)
    filemen.add_command(label='汽车租赁(D)',command = self.myfunc)
    filemen.add_command(label='油耗(mpg)(F)',command = self.myfunc)
    filemen.add_command(label='油耗(U)',command = self.myfunc)
    #将查看菜单放入总菜单中
    allmenu.add_cascade(label='查看(V)',menu=filemenu)

    #创建编辑总菜单
    editmenu= tkinter.Menu(allmenu,tearoff=0)
    editmenu.add_command(label='复制(C) Ctrl+C',command= self.myfunc)
    editmenu.add_command(label='粘贴(P) Ctrl+V',command= self.myfunc)
    #分割线
    editmenu.add_separator()
    editmenu.add_command(label='历史记录(H)',command = self.myfunc)
    #将编辑菜单加入总菜单
    allmenu.add_cascade(label='编辑(E)',menu=editmenu)

    #创建帮助菜单
    helpmenu= tkinter.Menu(allmenu,tearoff=0)
    helpmenu.add_command(label='查看帮助(V) Ctrl+F1',command = self.myfunc)
    #分割线
    helpmenu.add_separator()
    helpmenu.add_command(label='关于计算器(A)',command = self.myfunc)
    #将帮总菜单助菜单加入
    allmenu.add_cascade(label='帮助(H)',menu=helpmenu)

    #摆放菜单
    self.root.config(menu = allmenu)

    # 设置一个全局变量 运算数字和f符号的列表
    lists = []
    # 添加一个用于判断是否按下运算符号的标志
    isPressSign = False
    # 添加一个等于号的标志
    pressEqual = False
    #操作函数
    #数字函数
    def pressNum(self,num):
    #全局变量
    global lists
    global isPressSign

    # 判断是否按下了运算符号
    if self.isPressSign == False:
    pass
    else:
    self.result.set(0)
    # 重置运算符号的状态
    self.isPressSign = False

    # 获取面板中的原有数字
    oldnum = self.result.get()
    # 判断界面数字是否为0
    if oldnum == '0':
    self.result.set(num)
    else:
    # 链接上 新按下的数字
    newnum = oldnum + num
    # 将按下的数字写到面板中
    self.result.set(newnum)


    # 运算函数
    def pressCompute(self,sign):

    # 保存已经按下的数字和运算符号
    # 获取界面数字
    num = self.result.get()
    self.lists.append(num)

    # 保存按下的操作符号
    self.lists.append(sign)

    # 设置运算符号为按下状态)
    self.isPressSign = True


    # 获取运算结果
    def pressEqual(self):
    # 全局化操作
    global lists

    # 获取所有的列表中的内容(之前的数字和操作)

    # 获取当前界面尚的数字
    curnum = self.result.get()
    # 将当前界面的数数字存入列表
    self.lists.append(curnum)
    # 将列表转化为字符串
    computeStr = ''.join(self.lists)
    # 使用eval执行字符串中的运算即可
    endNum = eval(computeStr)

    # 将运算结果显式到界面中
    self.result.set(endNum)
    # 清空运算列表
    self.lists.clear()

    #MC键
    def pressMc(self):
    tkinter.messagebox.showerror(title='MC键',message='无法定义按键')

    #MR键
    def pressMr(self):
    tkinter.messagebox.showerror(title='MR键',message='无法定义按键')

    #MS键
    def pressMs(self):
    tkinter.messagebox.showerror(title='MS键',message='无法定义按键')

    #M+键
    def pressAdd(self):
    tkinter.messagebox.showerror(title='M+键',message='无法定义按键')

    #M-键
    def pressSub(self):
    tkinter.messagebox.showerror(title='M-键',message='无法定义按键')

    #删除键(←)
    def pressDelete(self):
    #获取当前数的长度
    len1 = len(self.result.get())
    #判断长度是否大于1
    if len1 > 1:
    #每次执行按键功能,取片去除最后一位数,再输出显示
    num1 = self.result.get()
    num1 = num1[:len1-1]
    self.result.set(num1)

    # 清除键(CE)
    def pressCE(self):
    self.result.set(0)

    #清除键(C)
    def pressClear(self):
    self.result.set(0)

    #正负号键(±)
    def pressSign(self):
    # 获取当前的数,乘-1后输出到当前显示
    if float(self.result.get()) == 0:
    self.result.set(0)
    else:
    self.result.set(-1*float(self.result.get()))

    #根号键(√)
    def pressSqrt(self):
    #获取当前的数,根平方后输出到当前显示
    if float(self.result.get()) <= 0:
    self.result.set('请输入大于0的整数')
    else:
    self.result.set(math.sqrt(float(self.result.get())))

     

    #倒数键(1/x)
    def pressRec(self):
    if float(self.result.get()) == 0:
    self.result.set(0)
    else:
    self.result.set(1/float(self.result.get()))

     

    #小数点键(.)
    def pressDec(self,Del):
    # 判断小数点是否被按下
    if '.' in self.result.get():
    pass
    else:
    self.result.set(self.result.get() + Del)

    # 判断等号是否被按下
    if self.pressEqual == True:
    self.result.set('0' + Del)
    # 重置运算符状态
    self.pressEqual = False

    # 判断运算符是否被按下
    if self.isPressSign == True:
    self.result.set('0' + Del)
    #重置运算符状态
    self.isPressSign = False

    def showlabel(self):
    #界面布局
    #按钮show
    self.result = tkinter.StringVar()
    self.result.set(0)

    show = tkinter.Label(self.root,textvariable=self.result,bg = 'white',font = ('黑体',20),anchor = 'e')
    show.place(x = 5, y = 5,width = 270)

    #第一行
    btn = tkinter.Button(self.root,text = 'MC',command = self.pressMc)
    btn.place(x = 5, y = 60, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = 'MR',command = self.pressMr)
    btn.place(x = 60, y = 60, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = 'MS',command = self.pressMs)
    btn.place(x = 115, y = 60, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = 'M+',command = self.pressAdd)
    btn.place(x = 170, y = 60, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = 'M-',command = self.pressSub)
    btn.place(x = 225, y = 60, width = 50, height = 50)

    #第二行
    btn = tkinter.Button(self.root,text = '←',command = self.pressDelete)
    btn.place(x = 5, y = 120, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = 'CE',command= self.pressCE)
    btn.place(x = 60, y = 120, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = 'C',command = self.pressClear)
    btn.place(x = 115, y = 120, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = '±',command= self.pressSign)
    btn.place(x = 170, y = 120, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = '√',command = self.pressSqrt)
    btn.place(x = 225, y = 120, width = 50, height = 50)

    #第三行
    btn7 = tkinter.Button(self.root,text = 7,command = lambda : self.pressNum('7'))
    btn7.place(x = 5, y = 180, width = 50, height = 50)

    btn8 = tkinter.Button(self.root,text = 8,command = lambda : self.pressNum('8'))
    btn8.place(x = 60, y = 180, width = 50, height = 50)

    btn9 = tkinter.Button(self.root,text = 9,command = lambda : self.pressNum('9'))
    btn9.place(x = 115, y = 180, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = '/',command = lambda :self.pressCompute('/'))
    btn.place(x = 170, y = 180, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = '%',command =lambda:self.pressCompute('%'))
    btn.place(x = 225, y = 180, width = 50, height = 50)

    #第四行
    btn4 = tkinter.Button(self.root,text = 4,command = lambda : self.pressNum('4'))
    btn4.place(x = 5, y = 240, width = 50, height = 50)

    btn5 = tkinter.Button(self.root,text = 5,command = lambda : self.pressNum('5'))
    btn5.place(x = 60, y = 240, width = 50, height = 50)

    btn6 = tkinter.Button(self.root,text = 6,command = lambda : self.pressNum('6'))
    btn6.place(x = 115, y = 240, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = '*',command = lambda :self.pressCompute('*'))
    btn.place(x = 170, y = 240, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = '1/x',command = self.pressRec)
    btn.place(x = 225, y = 240, width = 50, height = 50)

    #第五行
    btn1 = tkinter.Button(self.root,text = 1,command = lambda : self.pressNum('1'))
    btn1.place(x = 5, y = 300, width = 50, height = 50)

    btn2 = tkinter.Button(self.root,text = 2,command = lambda : self.pressNum('2'))
    btn2.place(x = 60, y = 300, width = 50, height = 50)

    btn3 = tkinter.Button(self.root,text = 3,command = lambda : self.pressNum('3'))
    btn3.place(x = 115, y = 300, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = '-',command = lambda :self.pressCompute('-'))
    btn.place(x = 170, y = 300, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = '=',command = self.pressEqual)
    btn.place(x = 225, y = 300, width = 50, height = 110)

    #第六行
    btn0 = tkinter.Button(self.root,text = 0,command = lambda : self.pressNum('0'))
    btn0.place(x = 5, y = 360, width = 105, height = 50)

    btn = tkinter.Button(self.root,text = '.',command =lambda: self.pressDec('.'))
    btn.place(x = 115, y = 360, width = 50, height = 50)

    btn = tkinter.Button(self.root,text = '+',command = lambda :self.pressCompute('+'))
    btn.place(x = 170, y = 360, width = 50, height = 50)

    calculator = jsq()

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  • 原文地址:https://www.cnblogs.com/cuihengyue/p/7906504.html
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