pyclass

Another Python binding of the CMB Boltzmann code CLASS, v3, with access to velocity power spectra.

Dependencies

• numpy
• cython

The CLASS code will be downloaded and compiled at installation.

Installation

python -m pip install git+https://github.com/adematti/pyclass

Mac OS

If you wish to use clang compiler (instead of gcc), you may encounter an error related to -fopenmp flag. In this case, you can try to export:

export CC=clang

Before installing pyclass. This will set clang OpenMP flags for compilation (see lesgourg/class_public#405). Note that with Mac OS gcc can point to clang.

Examples

See the tests of the code in pyclass/tests/ for examples of using each of the main CLASS modules.

Extensions

To implement a CLASS extension extension:

• copy-paste base into e.g. extension
• update the version and url in extension/_version.py
• if necessary, make the changes to the Cython extension/binding.pyx and extension/cclassy.pxd files for the specific extension

That's it! Upon installation (pip install --user .), the extension is automatically compiled (together with base), and can be imported as:

from pyclass.extension import *

Acknowledgments

This code heavily relies on classylss: http://classylss.readthedocs.io/.