如何用Python写一个计算器软件 附带效果图

该计算器使用Python  tkinter模块开发

效果如下图

 import tkinter #导入tkinter模块

 root  = tkinter.Tk()
 root.minsize(280,500)
 root.title('李蛟龙的计算器')

 #1.界面布局
 #显示面板
 result = tkinter.StringVar()
 result.set(0)                           #显示面板显示结果1，用于显示默认数字0
 result2 = tkinter.StringVar()           #显示面板显示结果2，用于显示计算过程
 result2.set('')
 #显示版
 label = tkinter.Label(root,font = ('微软雅黑',20),bg = '#EEE9E9',bd ='',fg = '#828282',anchor = 'se',textvariable = result2)
 label.place(width = 280,height = 170)
 label2 = tkinter.Label(root,font = ('微软雅黑',30),bg = '#EEE9E9',bd ='',fg = 'black',anchor = 'se',textvariable = result)
 label2.place(y = 170,width = 280,height = 60)

 #数字键按钮

 btn7 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn7.place(x = 0,y = 285,width = 70,height = 55)
 btn8 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn8.place(x = 70,y = 285,width = 70,height = 55)
 btn9 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn9.place(x = 140,y = 285,width = 70,height = 55)

 btn4 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn4.place(x = 0,y = 340,width = 70,height = 55)
 btn5 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn5.place(x = 70,y = 340,width = 70,height = 55)
 btn6 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn6.place(x = 140,y = 340,width = 70,height = 55)

 btn1 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn1.place(x = 0,y = 395,width = 70,height = 55)
 btn2 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn2.place(x = 70,y = 395,width = 70,height = 55)
 btn3 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn3.place(x = 140,y = 395,width = 70,height = 55)
 btn0 = tkinter.Button(root,text = '',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda : pressNum(''))
 btn0.place(x = 70,y = 450,width = 70,height = 55)

 #运算符号按钮
 btnac = tkinter.Button(root,text = 'AC',bd = 0.5,font = ('黑体',20),fg = 'orange',command = lambda :pressCompute('AC'))
 btnac.place(x = 0,y = 230,width = 70,height = 55)
 btnback = tkinter.Button(root,text = '←',font = ('微软雅黑',20),fg = '#4F4F4F',bd = 0.5,command = lambda:pressCompute('b'))
 btnback.place(x = 70,y = 230,width = 70,height = 55)
 btndivi = tkinter.Button(root,text = '÷',font = ('微软雅黑',20),fg = '#4F4F4F',bd = 0.5,command = lambda:pressCompute('/'))
 btndivi.place(x = 140,y = 230,width = 70,height = 55)
 btnmul = tkinter.Button(root,text ='×',font = ('微软雅黑',20),fg = "#4F4F4F",bd = 0.5,command = lambda:pressCompute('*'))
 btnmul.place(x = 210,y = 230,width = 70,height = 55)
 btnsub = tkinter.Button(root,text = '-',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda:pressCompute('-'))
 btnsub.place(x = 210,y = 285,width = 70,height = 55)
 btnadd = tkinter.Button(root,text = '+',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda:pressCompute('+'))
 btnadd.place(x = 210,y = 340,width = 70,height = 55)
 btnequ = tkinter.Button(root,text = '=',bg = 'orange',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda :pressEqual())
 btnequ.place(x = 210,y = 395,width = 70,height = 110)
 btnper = tkinter.Button(root,text = '%',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda:pressCompute('%'))
 btnper.place(x = 0,y = 450,width = 70,height = 55)
 btnpoint = tkinter.Button(root,text = '.',font = ('微软雅黑',20),fg = ('#4F4F4F'),bd = 0.5,command = lambda:pressCompute('.'))
 btnpoint.place(x = 140,y = 450,width = 70,height = 55)

 #操作函数
 lists = []                            #设置一个变量 保存运算数字和符号的列表
 isPressSign = False                  #添加一个判断是否按下运算符号的标志,假设默认没有按下按钮
 isPressNum = False
 #数字函数
 def pressNum(num):                   #设置一个数字函数 判断是否按下数字 并获取数字将数字写在显示版上
     global lists                     #全局化lists和按钮状态isPressSign
     global isPressSign
     if isPressSign == False:
         pass
     else:                            #重新将运算符号状态设置为否
         result.set(0)
         isPressSign = False

     #判断界面的数字是否为0
     oldnum = result.get()             #第一步
     if oldnum =='':                 #如过界面上数字为0 则获取按下的数字
         result.set(num)
     else:                            #如果界面上的而数字不是0  则链接上新按下的数字
         newnum = oldnum + num
         result.set(newnum)            #将按下的数字写到面板中

 #运算函数
 def pressCompute(sign):
     global lists
     global isPressSign
     num = result.get()              #获取界面数字
     lists.append(num)               #保存界面获取的数字到列表中

     lists.append(sign)              #讲按下的运算符号保存到列表中
     isPressSign = True

     if sign =='AC':                #如果按下的是'AC'按键，则清空列表内容，讲屏幕上的数字键设置为默认数字0
         lists.clear()
         result.set(0)
     if sign =='b':                 #如果按下的是退格‘’，则选取当前数字第一位到倒数第二位
         a = num[0:-1]
         lists.clear()
         result.set(a)

 #获取运算结果函数
 def pressEqual():
     global lists
     global isPressSign

     curnum = result.get()           #设置当前数字变量，并获取添加到列表
     lists.append(curnum)

     computrStr = ''.join(lists)     #讲列表内容用join命令将字符串链接起来
     endNum = eval(computrStr)       #用eval命令运算字符串中的内容
 #    a = str(endNum)
 #   b = '='+a                       #给运算结果前添加一个 ‘=’ 显示   不过这样写会有BUG 不能连续运算，这里注释，不要 =
 #   c = b[0:10]                     #所有的运算结果取9位数
     result.set(endNum)                   #讲运算结果显示到屏幕1
     result2.set(computrStr)         #将运算过程显示到屏幕2
     lists.clear()                   #清空列表内容

 root.mainloop()

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因为字数不够，此处省略一万字，用#号代替

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