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 messagebox
class 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, text=c, width=2). \
                        grid(row=rindex + 1, column=cindex, columnspan=2, sticky=NSEW)
                elif c==".":
                    Button(self, text=c, width=2). \
                        grid(row=rindex + 1, column=cindex+1,sticky=NSEW)
                else:
                    Button(self,text=c,width=2).\
                            grid(row=rindex+1,column=cindex,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