import os
import sys
import tkinter as tk
 
class CustomButton(tk.Button):
    def __init__(self, master, gridargs, **kwargs):
        tk.Button.__init__(self, master, kwargs)
        self.gridargs = gridargs
        self.grid(gridargs)
        self.entry = tk.Entry(master, width=8)
        self.entry.insert(0, self['text'])
        self.bind('<Button-3>', self.on_mouse_rightclick)
        self.entry.bind('<Return>', self.on_entry_edit)
        self.entry.bind('<Escape>', self.on_escape)
        
    def on_mouse_rightclick(self, event):
        print('on_mouse_rightclick')
        self.entry.grid(self.gridargs)
        self.grid_forget()
        
    def on_entry_edit(self, event):
        print('on_entry_edit')
        self['text'] = self.entry.get()
        self.grid(self.gridargs)
        self.entry.grid_forget()
        
    def on_escape(self, event):
        print('on_escape')
        self.entry.delete(0, 'end')
        self.entry.insert(0, self['text'])
        self.grid(self.gridargs)
        self.entry.grid_forget()
 
class Application(tk.Tk):
    def __init__(self):
        tk.Tk.__init__(self)
        CustomButton(self, {'row':0}, text='12345')
        CustomButton(self, {'row':1}, text='abcde')

app = Application()
app.mainloop()