tkinter-statusbar

self.statusStr = tk.StringVar()
self.status = tk.Label(text='Ready...', textvariable=self.statusStr, bd=1, relief=tk.SUNKEN, anchor='w')
self.status.pack(side=tk.BOTTOM, fill=tk.X)

# modify text
self.statusStr.set('圆弧计算失败. 请调整计算点数后重试...')