python GUI tkinter图片按钮功能

import tkinter as tk

def msgShow():

label.config(text="hehehe", bg="lightyellow", fg="blue")

root = tk.Tk()

root.title('图片按钮')

imgBtn = tk.PhotoImage(file=r"C:\pic\pdf.png")

tk.Button(root, image=imgBtn, command=msgShow).pack()

label = tk.Label(root)

label.pack()

tk.mainloop()