Python 计算器界面设计

# coding=utf-8"""计算器软件界面设计"""from tkinter import *from tkinter import messageboxclass Application(Frame):    def __init__(self,master=None):        super().__init__(master)        self.master = master        self.pack()        self.creatWidget()    def creatWidget(self):        """实现计算器"""        btnText =(("mc","m+","m-","mr"),("c","±","÷","*"),(7,8,9,"-"),(4,5,6,"+"),(1,2,3,"="),(0,".")                )        Entry(self).grid(row=0,column=0,columnspan=4,pady=10)        for rindex,r in enumerate(btnText):            for cindex,c in  enumerate(r):                if c=="=":                    # rowspan 跨行                    # columnspan 跨列                    Button(self,text=c,width=2).                        grid(row=rindex+1,column=cindex,rowspan=2,sticky=NSEW)                elif c==0:                    Button(self,width=2).                         grid(row=rindex + 1,columnspan=2,sticky=NSEW)                elif c==".":                    Button(self,column=cindex+1,sticky=NSEW)                else:                    Button(self,width=2).                            grid(row=rindex+1,sticky=EW)if __name__=="__main__":    root = Tk()    root.geometry("160x240+100+200")    app = Application(master=root)    root.mainloop()# 学习grid布局 做了个小的计算器界面 # 体会 grid布局主要是根据坐标的位置来确定具体在哪里填充控件# 尤其是对于cowspan 和 columnspan的操作使用# 初学Python 如有不足 请多多指教