I have been trying to parse a file with xml.etree.ElementTree
:
import xml.etree.ElementTree as ET
from xml.etree.ElementTree import ParseError
def analyze(xml):
it = ET.iterparse(file(xml))
count = 0
last = None
try:
for (ev, el) in it:
count += 1
last = el
except ParseError:
print("catastrophic failure")
print("last successful: {0}".format(last))
print('count: {0}'.format(count))
This is of course a simplified version of my code, but this is enough to break my program. I get this error with some files if I remove the try-catch block:
Traceback (most recent call last):
File "<pyshell#22>", line 1, in <module>
from yparse import analyze; analyze('file.xml')
File "C:\Python27\yparse.py", line 10, in analyze
for (ev, el) in it:
File "C:\Python27\lib\xml\etree\ElementTree.py", line 1258, in next
self._parser.feed(data)
File "C:\Python27\lib\xml\etree\ElementTree.py", line 1624, in feed
self._raiseerror(v)
File "C:\Python27\lib\xml\etree\ElementTree.py", line 1488, in _raiseerror
raise err
ParseError: reference to invalid character number: line 1, column 52459
The results are deterministic though, if a file works it will always work. If a file fails, it always fails and always fails at the same point.
The strangest thing is I'm using the trace to find out if I have any malformed XML that's breaking the parser. I then isolate the node that caused the failure. But when I create an XML file containing that node and a few of its neighbors, the parsing works!
This doesn't seem to be a size problem either. I have managed to parse much larger files with no problems.
Any ideas?
I'm not sure if this answers your question, but if you want to use an exception with the ParseError raised by element tree, you would do this:
except ET.ParseError:
print("catastrophic failure")
print("last successful: {0}".format(last))
Source: http://effbot.org/zone/elementtree-13-intro.htm
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