python - pickle.dump meet RuntimeError: maximum recursion depth exceeded in cmp -


i have noticed may caused beautifulsoup or recursive data structure. however, data structure cause error seems no problem:

class movie: def __init__(self, name="", dscore=0, mscore=0, durl="", murl=""):      self.name = name     self.dscore = float(dscore)     self.mscore = float(mscore)     self.durl = durl     self.murl = murl def __str__(self):     return unicode(self.name) + u' / ' + unicode(self.dscore) + u' / ' + unicode(self.mscore) \         + u' / ' + unicode(self.durl) + u' / ' + unicode(self.murl)

the statement causing problem is:

datadict['movieinfo'] = movieinfo

and 

pickle.dump(datadict, f, true)

following function:

def savedata(): global linkurlqueue global movieset global movieinfo global linkurlset global movieurlqueue datadict = {} datadict['linkurlset'] = linkurlset datadict['movieset'] = movieset #datadict['movieinfo'] = movieinfo datadict['linkurlqueue'] = linkurlqueue datadict['movieurlqueue'] = movieurlqueue f = open('movieinfo.txt', 'wb')  item in movieinfo:     f.write(item.__str__().encode('utf8') + '\n'.encode('utf8')) f.close() try:     print 'saving data...'     f = open('spider.dat', 'wb')     pickle.dump(datadict, f, true)     f.close() except ioerror e:     print 'ioerror, error no: %d' % e.no     print 'saved spider2.dat'     pickle.dump(datadict, open('spider2.dat', 'wb'))     time.sleep(10)

my complete source code:

spider.py: http://paste.ubuntu.com/7149731/

fetch.py: http://paste.ubuntu.com/7149732/

you can download , run.

besides, welcome coding style suggestions

well... solve problem myself...

the reason problem pickle cannot handle beautifulsoup!!! generally, cannot handle html parser.

i realize when passing arguments functions, should convert them str() or unicode() assignments, instead of remaining them beautifulsoup objects...

thanks everyone~


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