XML parsing in Python for big data

问题

I am trying to parse an XML file using Python. But the problem is that the XML file size is around 30GB. So, it's taking hours to execute:

tree = ET.parse('Posts.xml')

In my XML file, there are millions of child elements of the root. Is there any way to make it faster? I don't need all the children to parse. Even the first 100,000 would be fine. All I need is to set a limit for the depth to parse.

回答1:

You'll want an XML parsing mechanism that doesn't load everything into memory.

You can use ElementTree.iterparse or you could use Sax.

Here is a page with some XML processing tutorials for Python.

UPDATE: As @marbu said in the comment, if you use ElementTree.iterparse be sure to use it in such a way that you get rid of elements in memory when you've finished processing them.

来源：https://stackoverflow.com/questions/28160018/xml-parsing-in-python-for-big-data