What is python-dev package used for

python cpython
Abhisek picture Abhisek · Jun 23, 2015 · Viewed 87.2k times · Source

I recently installed lxml.

Before that I had to install all the dependencies for that. So I tried to install liblxml2-dev, liblxslt1-dev and python-dev (google searched for what packages are required for lxml)

but even after that I could not able to install lxml by using the command pip install lxml.

However as because I am using Python 3.4.0, I thought that may be there are different version of python-dev (thought came due to facing some similar version conflict problem). So I tried to install python3-dev.

Then I tried to install lxml using the same command said earlier and that worked!!!

As I am a newbie in this. So I google searched for those sentences and I could able to understand the meaning of lxml and xslt. I found a link for python-dev but I am not still sure what it is actually doing.

Could anyone help :)

Edit 1: OS - Ubuntu

Answer

Bernhard picture Bernhard · Jun 23, 2015

python-dev contains the header files you need to build Python extensions. lxml is a Python C-API extension that is compiled when you do pip install lxml. The lxml sources have at least something like #include <Python.h> in the code. The compiler looks for the Python.h file during compilation, hence those files need to be on your system such that they can be found. On Linux typically, the binary libraries and header files of packages like python are separate. Hence you can have Python installed and everything works fine but when you want to build extensions you need to install the corresponding dev package.

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