python3.4.3如何获取文件的路径

#coding:utf-8
from tkinter import *
from tkinter import filedialog
root = Tk()
root.filename = filedialog.askopenfilename(initialdir = "d:/",title = "选择文件",filetypes = (("jpeg files","*.jpg"),("all files","*.*")))
print (root.filename)