Member Avatar for sandeep.m

Hi please help me to install libxml2-2.7.1 and libxslt-1.1. fot python 2.5.2.
When i try to install libxml2-2.7.1, i gets installed but when i import the libxml2 in python interpreter then i get the following error:

Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "", line 1, in <module>
import libxml2mod
ImportError: /usr/local/lib/python2.5/site-packages/libxml2mod.so: undefined symbol: xmlTextReaderSetup

Please help me in resolving this issue.

Thanks in advance

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  • Latest Post Latest Post by woooee

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Generated

Quick diagnosis and what to check first: the symptom you describe most often comes from an ABI/version mismatch — the libxml2 Python extension was built against one libxml2 but at runtime a different libxml2 (without the needed xmlReader symbol) is being loaded. ’s suggestion to install both the C libraries and the Python bindings is correct; the common causes are multiple libxml2 installs (for example one in /usr/lib and another in /usr/local/lib) or the bindings being built against a different copy. (stackoverflow.com)

Immediate, safe checks to run (run these as the same user that runs Python):

xml2-config --version
ldd /usr/local/lib/python2.5/site-packages/libxml2mod.so
ldd /usr/local/lib/python2.5/site-packages/libxml2mod.so | grep libxml2
ls -l /usr/lib/libxml2.so* /usr/local/lib/libxml2.so*

What to look for: the ldd output must point to the libxml2 you expect. If it points to an older system .so, the Python module will fail to find newer symbols. Using LD_PRELOAD / LD_LIBRARY_PATH can be a quick test to confirm which library fixes the load. (stackoverflow.com)

How to fix it reliably: either make the correct libxml2 the system default (add its directory to /etc/ld.so.conf.d/ and run ldconfig), or rebuild the Python bindings against the libxml2/libxslt you installed. If you installed from source, build/install libxml2 and libxslt, then in the bindings tree run the Python build/install step so the generated libxml2mod.so links to the same library. Using your distribution’s libxml2-python/libxslt-python packages avoids this mismatch. (opensource.dell.com)

Practical notes: symlinking a .so from one site-packages to another can sometimes hide the problem but is brittle — prefer fixing the runtime library path or rebuilding. After any change, re-run the ldd check and then import in the same Python interpreter used by your application to confirm the problem is resolved. (linuxquestions.org)

Member Avatar for woooee

You have to install both libxml2 and the python binding for libxml2. You can find download links for both libraries here http://xmlsoft.org/ What distro are you using. Most disto's package managers can install these.

ImportError: /usr/local/lib/python2.5/site-packages/libxml2mod.so: undefined symbol:

See if the python bindings for libxml2 are in /usr/local/lib/python2.5/site-packages/. They could very well be installed in /usr/lib/python2.5/site-packages/ (no /local). If so, just symlink to /usr/local/lib...etc.

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