Python tkinter时钟的主题和夜主题

Question

我一直在研究制作使用Python Tkinter的时钟。我已设法这样做，并希望将其提升到一个新的水平：自动日/夜主题变化。我已经尝试使用strftime和我自己的代码来近距离估计它是白天还是黑夜。代码总是会给我错误的数字颜色，但是冒号的正确颜色。

有时它只适用于这个时钟代码，但不适用于我的完整代码。

这是我的完整代码：

#!/usr/bin/env python

import sys
if sys.version_info[0] == 2:
    import Tkinter as tk
else:
    import tkinter as tk
from time import sleep, strftime
import datetime
import feedparser
import time
from itertools import cycle
dark = {1:16, 2:17, 3:18, 4:19, 5:19, 6:20, 7:20, 8:19, 9:18, 10:17, 11:16, 12:16}
#month_number : sunrise_hour
light = {1:8, 2:7, 3:6, 4:5, 5:4, 6:4, 7:4, 8:5, 9:6, 10:6, 11:7, 12:8}
root = tk.Tk()
current_theme = "not set"
d = feedparser.parse('https://www.reddit.com/r/news/.rss')
post_list = cycle(d.entries)
def exitt():
    sleep(3)
    root.destroy()
def theme_updater(theme_bg, theme_fg):
    clock.config(bg=theme_bg, fg=theme_fg)
    extra_clock.config(bg=theme_bg, fg=theme_fg)
    label_rss.config(bg=theme_bg, fg=theme_fg)
    end.config(fg=theme_fg, bg=theme_bg)
time1 = ''
extra_time1 = ''
clock = tk.Label(root, font=('calibri light', 150))
clock.pack(fill=tk.BOTH, expand=1)
extra_clock = tk.Label(root, font=('calibri light', 45))
extra_clock.pack(fill=tk.BOTH, expand=1)
label_rss = tk.Label(root, font=('calibri', 14))
label_rss.pack(fill=tk.BOTH)
end = tk.Button(root, text="Exit", font=('bold', 18), bd=0, borderwidth=0, highlightthickness=0, command=lambda:exitt(), height=0, width=0)
end.pack(fill=tk.BOTH)
def rssfeeds():
    post = next(post_list)
    RSSFEED = post.title
    modTXT = 'r/news Feed:  ' + RSSFEED
    label_rss.config(text=modTXT)
    root.after(8000, rssfeeds)
rssfeeds()
def tick():
 global current_theme
 global time1
 time2 = strftime("%H:%M:%S")
 if time2 != time1:
  time1 = time2
  clock.config(text=time2)
 time_now = time.localtime()
 if time_now.tm_hour <= dark[time_now.tm_mon] or time_now.tm_hour < light[time_now.tm_mon]:
        if current_theme != "night":
            theme_updater("black", "white")
            current_theme = "night"
            print('Night time theme set.')
 else:
        if current_theme != "day":
            theme_updater("white", "black")
            current_theme = "day"
            print('Day time theme set.')
 clock.after(1000, tick)
def ticki():
 global extra_time1
 extra_time2 = strftime("%A, %d %B %Y")
 if extra_time2 != extra_time1:
  extra_time1 = extra_time2
  extra_clock.config(text=extra_time2)
 extra_clock.after(1000, ticki)
tick()
ticki()
w, h = root.winfo_screenwidth(), root.winfo_screenheight()
root.overrideredirect(1)
root.geometry("%dx%d+0+0" % (w, h))
root.focus_set()
root.mainloop()

这就是我的完整代码中的当天主题：和夜晚主题：