python小玩意——计算器

代码说明：

python语言利用tk实现一个简易计算器

具有0~9十位数字、符号’.’，以及±*/四则等运算功能，具有记忆存储功能（下一轮计算用到上一轮结果）、清零、删除功能。

效果如下：

代码如下：

import tkinter, time, decimal, math, string

root = tkinter.Tk()
root.title('计算器')
root.resizable(0, 0)
global cuncu, vartext, result, fuhao
result = fuhao = None
vartext = tkinter.StringVar()
cuncu = []


class anjianzhi:
    global cuncu, vartext, result, fuhao

    def __init__(self, anjian):
        self.anjian = anjian

    def jia(self):
        cuncu.append(self.anjian)
        vartext.set(''.join(cuncu))

    def tui(self):
        cuncu.pop()
        vartext.set(''.join(cuncu))

    def clear(self):
        cuncu.clear()
        vartext.set('')
        result = None
        fuhao = None

    def zhengfu(self):
        if cuncu[0]:
            if cuncu[0] == '-':
                cuncu[0] = '+'
            elif cuncu[0] == '+':
                cuncu[0] = '-'
            else:
                cuncu.insert(0, '-')
        vartext.set(''.join(cuncu))

    def xiaoshudian(self):
        if cuncu.count('.') >= 1:
            pass
        else:
            if cuncu == []:
                cuncu.append('0')
            cuncu.append('.')
            vartext.set(''.join(cuncu))

    def yunshuan(self):
        global cuncu, vartext, result, fuhao
        if vartext.get() == '':
            pass
        else:
            get1 = decimal.Decimal(vartext.get())
            if self.anjian in ('1/x', 'sqrt'):
                if self.anjian == '1/x':
                    result = 1 / get1
                elif self.anjian == 'sqrt':
                    result = math.sqrt(get1)
            elif self.anjian in ('+', '-', '*', '/', '='):
                if fuhao is not None:
                    get1 = decimal.Decimal(result)
                    get2 = decimal.Decimal(vartext.get())
                    if fuhao == '+':
                        result = get1 + get2
                    elif fuhao == '-':
                        result = get1 - get2
                    elif fuhao == '*':
                        result = get1 * get2
                    elif fuhao == '/':
                        result = get1 / get2
                else:
                    result = get1
                if self.anjian == '=':
                    fuhao = None
                else:
                    fuhao = self.anjian
            print(fuhao)
            print(result)
            vartext.set(str(result))
            cuncu.clear()


def copy1():
    # tkinter.Misc().clipboard_clear()
    tkinter.Misc().clipboard_append(string(vartext.get()))


def buju(root):
    global cuncu, vartext, result, fuhao
    entry1 = tkinter.Label(root, width=30, height=2, bg='white', anchor='se', textvariable=vartext)
    entry1.grid(row=0, columnspan=5)
    buttonMC = tkinter.Button(root, text='MC', width=5)
    buttonMR = tkinter.Button(root, text='MR', width=5)
    buttonMS = tkinter.Button(root, text='MS', width=5)
    buttonM1 = tkinter.Button(root, text='M+', width=5)
    buttonM2 = tkinter.Button(root, text='M-', width=5)
    buttonMC.grid(row=1, column=0)
    buttonMR.grid(row=1, column=1)
    buttonMS.grid(row=1, column=2)
    buttonM1.grid(row=1, column=3)
    buttonM2.grid(row=1, column=4)

    buttonJ = tkinter.Button(root, text='←', width=5, command=anjianzhi('c').tui)
    buttonCE = tkinter.Button(root, text='CE', width=5)
    buttonC = tkinter.Button(root, text=' C ', width=5, command=anjianzhi('c').clear)
    button12 = tkinter.Button(root, text='±', width=5, command=anjianzhi('c').zhengfu)
    buttonD = tkinter.Button(root, text='√', width=5, command=anjianzhi('sqrt').yunshuan)
    buttonJ.grid(row=2, column=0)
    buttonCE.grid(row=2, column=1)
    buttonC.grid(row=2, column=2)
    button12.grid(row=2, column=3)
    buttonD.grid(row=2, column=4)

    button7 = tkinter.Button(root, text=' 7 ', width=5, command=anjianzhi('7').jia)
    button8 = tkinter.Button(root, text=' 8 ', width=5, command=anjianzhi('8').jia)
    button9 = tkinter.Button(root, text=' 9 ', width=5, command=anjianzhi('9').jia)
    buttonc = tkinter.Button(root, text=' / ', width=5, command=anjianzhi('/').yunshuan)
    buttonf = tkinter.Button(root, text=' % ', width=5)
    button7.grid(row=3, column=0)
    button8.grid(row=3, column=1)
    button9.grid(row=3, column=2)
    buttonc.grid(row=3, column=3)
    buttonf.grid(row=3, column=4)

    button4 = tkinter.Button(root, text=' 4 ', width=5, command=anjianzhi('4').jia)
    button5 = tkinter.Button(root, text=' 5 ', width=5, command=anjianzhi('5').jia)
    button6 = tkinter.Button(root, text=' 6 ', width=5, command=anjianzhi('6').jia)
    buttonx = tkinter.Button(root, text=' * ', width=5, command=anjianzhi('*').yunshuan)
    buttonfs = tkinter.Button(root, text='1/x', width=5, command=anjianzhi('1/x').yunshuan)
    button4.grid(row=4, column=0)
    button5.grid(row=4, column=1)
    button6.grid(row=4, column=2)
    buttonx.grid(row=4, column=3)
    buttonfs.grid(row=4, column=4)

    button1 = tkinter.Button(root, text=' 1 ', width=5, command=anjianzhi('1').jia)
    button2 = tkinter.Button(root, text=' 2 ', width=5, command=anjianzhi('2').jia)
    button3 = tkinter.Button(root, text=' 3 ', width=5, command=anjianzhi('3').jia)
    button_ = tkinter.Button(root, text=' - ', width=5, command=anjianzhi('-').yunshuan)
    buttondy = tkinter.Button(root, text=' \n = \n ', width=5, command=anjianzhi('=').yunshuan)
    button1.grid(row=5, column=0)
    button2.grid(row=5, column=1)
    button3.grid(row=5, column=2)
    button_.grid(row=5, column=3)
    buttondy.grid(row=5, column=4, rowspan=2)

    button0 = tkinter.Button(root, text='   0   ', width=11, command=anjianzhi('0').jia)
    buttonjh = tkinter.Button(root, text=' . ', width=5, command=anjianzhi('c').xiaoshudian)
    buttonjia = tkinter.Button(root, text=' + ', width=5, command=anjianzhi('+').yunshuan)
    button0.grid(row=6, column=0, columnspan=2)
    buttonjh.grid(row=6, column=2)
    buttonjia.grid(row=6, column=3)


def caidan(root):
    menu = tkinter.Menu(root)
    submenu1 = tkinter.Menu(menu, tearoff=0)
    menu.add_cascade(label='查看', menu=submenu1)
    submenu2 = tkinter.Menu(menu, tearoff=0)
    submenu2.add_command(label='复制')
    submenu2.add_command(label='粘贴')
    menu.add_cascade(label='编辑', menu=submenu2)
    submenu = tkinter.Menu(menu, tearoff=0)
    submenu.add_command(label='查看帮助')
    submenu.add_separator()
    submenu.add_command(label='关于计算机')
    menu.add_cascade(label='帮助', menu=submenu)
    root.config(menu=menu)


buju(root)
caidan(root)
root.mainloop()
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