python小程序：用tkinter实现的简易计算器

结果呈现

实现了加、减、乘、除运算，并可以进行清除及删除操作。

代码

from tkinter import *

Calculator = Tk()
Calculator.geometry('320x195+400+120')
Calculator.title('计算器示例')

Formula = ''        # 记录算式
digit = 0           # 用于记算式的字符数
OutputNumber = 0    # 运算结果

# 定义函数方法
def input1():
    global Formula
    global digit
    Inputentry.insert(END,'1')
    Formula += '1'
    digit += 1
def input2():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'2')
    Formula += '2'
def input3():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'3')
    Formula += '3'
def input4():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'4')
    Formula += '4'
def input5():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'5')
    Formula += '5'
def input6():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'6')
    Formula += '6'
def input7():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'7')
    Formula += '7'
def input8():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'8')
    Formula += '8'
def input9():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'9')
    Formula += '9'
def input0():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'0')
    Formula += '0'
def inputPoint():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'.')
    Formula += '.'
def inputDivi():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'÷')
    Formula += '/'
def inputMultip():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'×')
    Formula += '*'
def inputSubtra():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'—')
    Formula += '-'
def inputAdd():
    global Formula
    global digit
    digit += 1
    Inputentry.insert(END,'+')
    Formula += '+'
def inputEqual():
    Outputentry.delete(0, END)
    global Formula
    global digit
    digit += 1
    Formula += ' '
    global OutputNumber
    Inputentry.insert(END,'=')
    try:
        OutputNumber = eval(Formula)
        Outputentry.insert(END, OutputNumber)
    except:
        Outputentry.insert(END, '输入有问题哦！')

def inputCE():
    global Formula
    global digit
    digit = 0
    Inputentry.delete(0, END)
    Formula = ''

def inputC():
    global Formula
    global OutputNumber
    global digit
    digit = 0
    Inputentry.delete(0, END)
    Formula = ''
    Outputentry.delete(0, END)
    OutputNumber = 0

def inputDel():
    global Formula
    global digit
    Formula = Formula[:-1]
    Inputentry.delete(digit-1,END)
    digit -= 1



# grid（网格）布局
# 定义组件
Input = Label(Calculator, text='输入:',width=10,anchor='n').grid(row=0, column=0, sticky=E + W)
Inputentry = Entry(Calculator, width=35)    # 输入文本框
Inputentry.grid(row=0, column=1, columnspan=3)
Output = Label(Calculator, text='输出:',width=10,anchor='n').grid(row=1, column=0, sticky=E + W)
Outputentry = Entry(Calculator, width=35)   # 输出文本框
Outputentry.grid(row=1, column=1, columnspan=3)
L1 = Button(Calculator, text='7', width=10, command = input7)
L2 = Button(Calculator, text='8', width=10, command = input8)
L3 = Button(Calculator, text='9', width=10, command = input9)
L4 = Button(Calculator, text='4', width=10, command = input4)
L5 = Button(Calculator, text='5', width=10, command = input5)
L6 = Button(Calculator, text='6', width=10, command = input6)
L7 = Button(Calculator, text='1', width=10, command = input1)
L8 = Button(Calculator, text='2', width=10, command = input2)
L9 = Button(Calculator, text='3', width=10, command = input3)
L10 = Button(Calculator, text='.', width=10, command = inputPoint)
L11 = Button(Calculator, text='0', width=10, command = input0)
L12 = Button(Calculator, text='=', width=20, command = inputEqual)
L13 = Button(Calculator, text='CE', width=10, command = inputCE)
L14 = Button(Calculator, text='C', width=10, command = inputC)
L15 = Button(Calculator, text='Back', width=10, command = inputDel)
L16 = Button(Calculator, text='÷', width=10, command = inputDivi)
L17 = Button(Calculator, text='×', width=10, command = inputMultip)
L18 = Button(Calculator, text='—', width=10, command = inputSubtra)
L19 = Button(Calculator, text='+', width=10, command = inputAdd)

# 规划布局

L13.grid(row=2, column=0)
L14.grid(row=2, column=1)
L15.grid(row=2, column=2)
L16.grid(row=2, column=3)
L1.grid(row=3, column=0)
L2.grid(row=3, column=1)
L3.grid(row=3, column=2)
L17.grid(row=3, column=3)
L4.grid(row=4, column=0)
L5.grid(row=4, column=1)
L6.grid(row=4, column=2)
L18.grid(row=4, column=3)
L7.grid(row=5, column=0)
L8.grid(row=5, column=1)
L9.grid(row=5, column=2)
L19.grid(row=5, column=3)
L10.grid(row=6, column=0)
L11.grid(row=6, column=1)
L12.grid(row=6, column=2, columnspan=2, sticky=E + W)  # 跨两列，左右紧贴


Calculator.mainloop()