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()