Python 时钟（简单的错误？）答案

【问题标题】：Python Clock (Simple Mistake?)Python 时钟（简单的错误？）
【发布时间】：2016-02-20 20:16:14
【问题描述】：

您好，我不知道下一步该做什么。我希望警报标签在 Tkinter 小部件打开后更新时间。任何想法都值得赞赏。我在网上查看了线程，但他们似乎以完全不同的方式来做这件事，我相信我有一种简单的方法可以让这个时钟正常工作。

from Tkinter import *
import time

#Window
alarm_window = Tk()

#Title
alarm_window.title('Alarm')

def off_press():
    alarm_window.destroy()

#Alarm Class
class Clock(object): 
    def __init__ (self, time, sleep):
        self.time =  time
        self.sleep = sleep 
        print "The time and date is %s" % (self.time) #temporary to see if it's working

        #Alarm
        alarm_label = Label(alarm_window, text = self.time)
        alarm_label.grid (row = 0, column = 1)

def refresh_time():
        for each in range(2): #only temporary until I find a way to make the label update
            alarm = Clock(time.ctime(), time.sleep(1))

#Off Button
off = Button(alarm_window, text = "Off", command = off_press)
off.grid (row = 1, column = 2)

#Snooze
snooze = Button(alarm_window, text = "Snooze")
snooze.grid (row= 1, column = 0)

#Run Program
refresh_time()

alarm_window.mainloop()

【问题讨论】：

标签： python tkinter label clock

【解决方案1】：

您可以使用Tk().after(1000, refresh_time) 每秒更新时间。
不要创建新标签来显示时间，而是使用label.configure(text=) 来更改标签文本。

我做了一些修改来显示一个采样时钟：

from Tkinter import *
import time

#Window
alarm_window = Tk()

#Title
alarm_window.title('Alarm')

def off_press():
    alarm_window.destroy()

#Alarm Class
class Clock(object): 
    def __init__ (self, time):
        self.time =  time

        print "The time and date is %s" % (self.time) #temporary to see if it's working

        #Alarm
        # Create instance variable to use it in "refresh_time"
        self.alarm_label = Label(alarm_window, text = self.time)
        self.alarm_label.grid (row = 0, column = 1)

def refresh_time():
        #for each in range(2): #only temporary until I find a way to make the label update

        #Change label text with "configure(text=)" method
        clock.alarm_label.configure(text=time.ctime())
        #Use recursivity to make call after 1 second
        alarm_window.after(1000, refresh_time)


#Off Button
off = Button(alarm_window, text = "Off", command = off_press)
off.grid (row = 1, column = 2)

#Snooze
snooze = Button(alarm_window, text = "Snooze")
snooze.grid (row= 1, column = 0)

#Run Program
#refresh_time()

#Create "clock" label
clock = Clock(time.ctime())

#Run "refresh_time" after 1 second
alarm_window.after(1000, refresh_time)
alarm_window.mainloop()

【讨论】：

感谢您的回复！我在主循环之前添加了这一行，我试图让标签更新。小部件现在启动后，打印语句继续工作。我觉得我在做一些非常愚蠢的事情哈哈
@Mel 您正在使用refresh_time 方法创建标签，最好使用label.configure(text=new_time)。
after(1, ...) 每毫秒更新一次，而不是每秒更新一次。除非您将时间显示为毫秒精度，否则您应该将该值设置为 CPU 密集度较低的值，例如 1000 (1000ms == 1 秒)
感谢您的所有帮助 :) 我能够通过重新开始来解决它，我想我只是写过头了。