.. note:: This page uses two different syntax variants: * Cython specific ``cdef`` syntax, which was designed to make type declarations concise and easily readable from a C/C++ perspective. * Pure Python syntax which allows static Cython type declarations in :ref:`pure Python code `, following `PEP-484 `_ type hints and `PEP 526 `_ variable annotations. To make use of C data types in Python syntax, you need to import the special ``cython`` module in the Python module that you want to compile, e.g. .. code-block:: python import cython If you use the pure Python syntax we strongly recommend you use a recent Cython 3 release, since significant improvements have been made here compared to the 0.29.x releases.