为 python3 安装 libxml2 绑定

Question

The Problem

I'm trying to build libxml ( libxml2-2.7.8 ) bindings for Python 3.2. When I run the following:

./configure --with-python=/usr/bin/python3.2

The compilation of libxml2-2.7.8 works...but the Python bindings for libxml2-2.7.8 don't!

Attempted Fixes

1. Ported setup.py and generator.py (using 2to3 , and some basic patches on generator.py )
2. Patched libxml.c and types.c as follows:
   • replace PyInt* by PyLong*
   • replace PyString* by PyBytes*

Current Situation

Unfortunately, it still wasn't enough. I ran python3.2 setup.py build and got the following error:

types.c:594:17: error: ‘PyInstanceObject’ undeclared (first use in this function)

I can't find the Python3 equivalent of PyInstanceObject !

Has anyone managed to compile libxml2 bindings for Python 3?

Did I miss something??? Can anybody help? :(

Answer 1

The PyInstanceObject is a part of the support for old style types, which is gone in Python 3 , and has been deprecated since Python 2.2. The trick here is to first update the bindings to use new-style classes, and then port to Python 3.

(Or use lxml, which wraps the libxml2 in a Pythonic XML classes).

I'm not 100% sure what the replacement is, I've never done old-style classes in C, but I think it's simply a PyObject.