from tkinter import * reset=True def buttonCallBack(event):   global label   global reset   num=event.widget['text']   if num=='C':     label['text']="0"     return   if num in "=":     label['text']=str(eval(label['text']))     reset=True     return    s=label['text']   if s=='0' or reset==True:     s=""     reset=False   label['text']=s+num #主窗口 root=Tk() root.wm_title("計算器") #顯示欄1 label=Label(root,text="0",background="white",anchor="e") label['width']=35 label['height']=2 label.grid(row=1,columnspan=4,sticky=W) #按鈕 showText="789/456*123-0.C+" for i in range(4):   for j in range(4):     b=Button(root,text=showText[i*4+j],width=7)     b.grid(row=i+2,column=j)     b.bind("<Button-1>",buttonCallBack) showText="()" for i in range(2):   b=Button(root,text=showText[i],width=7)   b.grid(row=6,column=2+i)   b.bind("<Button-1>",buttonCallBack) b=Button(root,text="=") b.grid(row=6,columnspan=2,sticky="we") b.bind("<Button-1>",buttonCallBack) root.mainloop()