def change_captcha():
image = Image.open(pj.gen_captcha())
photo = ImageTk.PhotoImage(image)
l["image"] = photo
l.image = photo
passwd.set("861861")
txt_pass = Entry(root, text=u"", textvariable=passwd)
txt_pass["show"] = "*"
txt_pass.grid(row=1, column=1)
Label(root, text=u"券商：").grid(row=2, column=0)
sel = StringVar()
sel.set(u"中信证券")
dd_secu = OptionMenu(root, sel, u"中信证券", "方正证券")
dd_secu.grid(row=2, column=1)
Label(root, text=u"验证码：").grid(row=3, column=0)
captcha = StringVar()
txt_captcha = Entry(root, text=u"", textvariable=captcha)
txt_captcha.grid(row=3, column=1)
image = Image.open(pj.gen_captcha())
photo = ImageTk.PhotoImage(image)
l = Label(root, image=photo)
l.image = photo
l.grid(row=4, column=1)
button_frame = Frame(root)
button_frame.grid(row=5, columnspan=2)
Button(button_frame, text=u"登录", command=login).grid(row=0, column=0)
Button(button_frame, text=u"退出", command=logout).grid(row=0, column=1)
Button(button_frame, text=u"换图", command=change_captcha).grid(row=0, column=2)
Button(button_frame, text=u"查询股东账户", command=get_stockaccount).grid(row=0, column=3)
Label(root, text=u"登录信息:").grid(row=0, column=2)
lg_info = StringVar()
