import tkinter
import tkinter.filedialog

root = tkinter.Tk()


def print_path():
    root.filename = tkinter.filedialog.askopenfilename(
        initialdir='C:/',
        title='Choose file',
        filetypes=[('excel', '*.xlx'),
                   ('gif images', '*.gif')]
    )

    print(root.filename)


b1 = tkinter.Button(root, text='Print path', command=print_path)
b1.pack(fill='x')

root.mainloop()