我正在使用OSX 10.6.8,Python 2.7.2和Tkinter版本8.5,我清理安装的Python,Tkinter和IDLE昨天清理早期安装的Python 3.2。我正在研究麻省理工学院的Open CourseWare中的“RSS Feed Filter”问题集(不是为了学分),它包含了几个我没有写过但不理解的模块,还有一个(news_gui中的Popup类)模块)抛出一个未处理的异常,我不知道如何调试。
# 6.00 Problem Set 5
# RSS Feed Filter
import pdb
#pdb.set_trace()
import feedparser
import string
import time
from project_util import translate_html
from news_gui import Popup
#################################
########## CODE OMITTED #########
#################################
import thread
def main_thread(p):
# A sample trigger list - you'll replace
# this with something more configurable in Problem 11
t1 = SubjectTrigger("Obama")
t2 = SummaryTrigger("MIT")
t3 = PhraseTrigger("Supreme Court")
t4 = OrTrigger(t2, t3)
triggerlist = [t1, t4]
# TODO: Problem 11
# After implementing readTriggerConfig, uncomment this line
#triggerlist = readTriggerConfig("triggers.txt")
guidShown = []
while True:
print "Polling..."
# Get stories from Google's Top Stories RSS news feed
stories = process("http://news.google.com/?output=rss")
# Get stories from Yahoo's Top Stories RSS news feed
stories.extend(process("http://rss.news.yahoo.com/rss/topstories"))
# Only select stories we're interested in
stories = filter_stories(stories, triggerlist)
# Don't print a story if we have already printed it before
newstories = []
for story in stories:
if story.get_guid() not in guidShown:
newstories.append(story)
for story in newstories:
guidShown.append(story.get_guid())
p.newWindow(story)
print "Sleeping..."
time.sleep(SLEEPTIME)
SLEEPTIME = 60 #seconds -- how often we poll
if __name__ == '__main__':
print '1'
p = Popup()
print '2'
thread.start_new_thread(main_thread, (p,))
print '3'
p.start()
print '4'
p.start()行(从底部开始的第二行)是从news_gui模块调用Popup,这是代码:
import Tkinter
import time
print help(Tkinter.Tk)
#root = Tk()
#root.withdraw()
import pdb
# The Popup class
class Popup:
def __init__(self):
print 'Popup init'
self.root = Tkinter.Tk()
self.root.withdraw()
"""
self.root.mainloop()
def drawALot():
self.root = Tk()
self.root.withdraw()
self.root.mainloop()
thread.start_new_thread(drawALot, ())
"""
def start(self):
print 'Popup start'
pdb.set_trace()
self.root.mainloop()
def _makeTheWindow(self, item):
"""
Private method that does the actual window drawing
"""
print 'Popup _makeTheWindow'
root = Tkinter.Toplevel()
root.wm_title("News Alert")
w = root.winfo_screenwidth()/20
h = root.winfo_screenheight()/4
title = Tkinter.Text(root, padx=5, pady=5, height=3, wrap=Tkinter.WORD, bg="white")
title.tag_config("title", foreground="black", font=("helvetica", 12, "bold"))
title.tag_config("subject", foreground="black", font=("helvetica", 12, "bold"))
title.insert(Tkinter.INSERT, "Title: %s" % item.get_title(), "title")
title.insert(Tkinter.INSERT, "\nSubject: ", "subject")
title.insert(Tkinter.INSERT, item.get_subject().rstrip(), "subject")
title.config(state=Tkinter.DISABLED, relief = Tkinter.FLAT)
title.grid(sticky=Tkinter.W+Tkinter.E)
print '_makeTheWindow .5'
summary = Tkinter.Text(root, padx=10, pady=5, height=15, wrap=Tkinter.WORD, bg="white")
summary.tag_config("text", foreground="black", font=("helvetica", 12))
summary.insert(Tkinter.INSERT, item.get_summary().lstrip(), "text")
summary.config(state=Tkinter.DISABLED, relief = Tkinter.FLAT)
summary.grid(sticky=Tkinter.W+Tkinter.E)
link = Tkinter.Text(root, padx=5, pady=5, height=4, bg="white")
link.tag_config("url", foreground="blue", font=("helvetica", 10, "bold"))
link.insert(Tkinter.INSERT, item.get_link(), "url")
link.config(state=Tkinter.DISABLED, relief=Tkinter.FLAT)
link.grid(sticky=Tkinter.W+Tkinter.E)
print '_makeTheWindow end'
def newWindow(self, item):
"""
Displays a popup with the contents of the NewsStory newsitem
"""
print 'Popup newWindow'
self.root.after(0, self._makeTheWindow, item)
当我使用pdb运行时,这是我的输出:
None
1
Popup init
2
3Polling...
Popup start
> /Users/**********/Desktop/Learn/CS Stuffs/6-00sc-spring-2011/6-00sc-spring-2011/contents/unit-2/lecture-12-introduction-to-simulation-and-random-walks/ps5/news_gui.py(31)start()
-> self.root.mainloop()
(Pdb) s
--Call--Unhandled exception in thread started by
<function main_thread at 0x1026ed848>>
/Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py(1015)mainloop()
-> def mainloop(self, n=0):
(Pdb) s
> /Library/Frameworks/Python.framework/Versions/2.7/lib/python2.7/lib-tk/Tkinter.py(1017)mainloop()
-> self.tk.mainloop(n)
(Pdb) s
然后它挂起。我可以说这与线程和Tkinter有关,但我不知道下一步该做什么。
编辑:刚刚在Windows 7虚拟机上安装了Python 2.7.2,问题就出现了。
答案 0 :(得分:1)
我发现了一些解决方案,但我不能说它的整体适应性。它可能会帮助其他人做类似的泡菜,但如果有更多知识渊博的人可以帮助,那也是有帮助的。
我从http://tkinter.unpythonic.net/wiki/mtTkinter下载了mtTkinter。它说:“修改后的代码拦截了线程外的Tkinter调用,并通过一个队列进行编组,该队列由主循环中定期运行的'after'事件读取。”
不确定具体如何,但它解决了问题。