Cython .pxd Declarations
In addition to the header files, several cimport-able .pxd
Cython declaration files are provided:
>>> bezier_directory
'.../site-packages/bezier'
>>> print_tree(bezier_directory, suffix=".pxd")
bezier/
_curve.pxd
_curve_intersection.pxd
_helpers.pxd
_status.pxd
_triangle.pxd
_triangle_intersection.pxd
For example, cimport bezier._curve will provide all the functions
in bezier/curve.h.