from Tkinter import *
from tkMessageBox import askyesno
from tkFileDialog import askopenfilename

root = Tk()

def ask_file():
  file_name = askopenfilename()
  print file_name

def ask_confirm():
  answer = askyesno()
  print answer

Button(root, text='Ask file', command=ask_file).pack()
Button(root, text='Ask confirm', command=ask_confirm).pack()

root.mainloop()