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The traceback and its context for the exception raised in Python 2.7 is:
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Done retrieving 'ftp://ftp.gnome.org/pub/debian/dists/stable/main/source/Sources.bz2'; read 4539023 bytes
Start retrieving 'ftp://ftp.gnome.org/pub/debian/dists/stable/main/source/Sources.bz2'
Start retrieving 'ftp://ftp.gnome.org/pub/debian/dists/stable/main/source/Sources.bz2'
Retrieval of 'ftp://ftp.gnome.org/pub/debian/dists/stable/main/source/Sources.bz2' failed with error: [Errno ftp error] 200 Switching to Binary mode.
Traceback (most recent call last):
 File "urllibftpbug-non-interactive.py", line 62, in _getTask
 self._fromFile = urllib.urlopen(self.fromURL)
 File "/home/schwa/sd/python/cpython/Lib/urllib.py", line 84, in urlopen
 return opener.open(url)
 File "/home/schwa/sd/python/cpython/Lib/urllib.py", line 205, in open
 return getattr(self, name)(url)
 File "/home/schwa/sd/python/cpython/Lib/urllib.py", line 548, in open_ftp
 (fp, retrlen) = self.ftpcache[key].retrfile(file, type)
 File "/home/schwa/sd/python/cpython/Lib/urllib.py", line 886, in retrfile
 conn = self.ftp.ntransfercmd(cmd)
 File "/home/schwa/sd/python/cpython/Lib/ftplib.py", line 326, in ntransfercmd
 host, port = self.makepasv()
 File "/home/schwa/sd/python/cpython/Lib/ftplib.py", line 304, in makepasv
 host, port = parse227(self.sendcmd('PASV'))
 File "/home/schwa/sd/python/cpython/Lib/ftplib.py", line 790, in parse227
 raise error_reply, resp
IOError: [Errno ftp error] 200 Switching to Binary mode.
Total bytes: 4539023
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I printed the traceback by adding traceback.print_exc() at the end of the _getTask method:
 except Exception, e:
 self._cleanup(e)
 traceback.print_exc()