Question

我正在使用tkinter处理这个python代码。我想将标签set_hour的状态更改为＆＃34; active＆＃34;按下＆＃39; j。每次我运行我的代码时，我都会收到错误消息，说明没有定义set_hour。我是否需要使用＆＃34; self＆＃34;这里？为什么你能解释一下。谢谢

class SetClock:
def __init__(self, parent):
    self.myParent = parent

    self.current_datetime_label = tkinter.Label(root, text=datetime.datetime.now(), bg = "black", foreground="white").grid(row=1)
    #current_time_label.pack()

    self.menu_label = tkinter.Label(root, text="Menu", bg="sky blue", foreground="black",width=18).grid(row=2)
    self.set_day = tkinter.Label(root, text="Set Day", bg="blue",foreground="white",width=9,state="active").grid(row=2, column=1)
    self.set_hour = tkinter.Label(root, text="Set Hour",bg="blue",foreground="white",width=9).grid(row=2, column=2)
    self.set_mintutes = tkinter.Label(root, text="Set Minutes", bg="blue",foreground="white",width=10).grid(row=2, column=3)
    self.exit_label = tkinter.Label(root, text="Exit", bg="black", foreground="white").grid(row=2, column=4)

    self.day_menu_label = tkinter.Label(root, text="Day",bg="sky blue",width=18).grid(row=3)
    #menu_label.pack(side="right")
    #current_time_label.pack()

def navigate_menu(event):
    current_pressed = str(event.char)
    print("pressed", current_pressed)
    if current_pressed is 'j':
        print("ok")
        set_hour.config(state="active")

root = Tk()    
#frame = Frame(root)
setclock = SetClock(root)
root.title("Set Clock")
root.minsize(width=500,height=500)
root.bind("<Key>",SetClock.navigate_menu)
root.mainloop()

Answer 1

您需要将navigate_menu定义为实例方法：

def navigate_menu(self, event):
    current_pressed = str(event.char)
    print("pressed", current_pressed)
    if current_pressed is 'j':
        print("ok")
        self.set_hour.config(state="active")

绑定它时，改为传递绑定方法：

root.bind("<Key>", setclock.navigate_menu)

另外，单独Label创建行和grid()行。否则，self.set_hour变为None，因为grid()方法返回None。

self.set_hour = tkinter.Label(root, text="Set Hour",bg="blue",foreground="white",width=9)
self.set_hour.grid(row=2, column=2)

Answer 2

grid()返回None，因此您必须

self.set_hour = tkinter.Label(...)
self.set_hour.grid(...)

name＆＃39; set_hour＆＃39;没有定义

2 个答案: