OpenGL extension ARB.clear_buffer_object
This module customises the behaviour of the OpenGL.raw.GL.ARB.clear_buffer_object to provide a more Python-friendly API
Overview (from the spec)
Buffer objects are fundamental to the operation of OpenGL. Buffers are used as a source of data for vertices and indices, read through buffer textures in shaders, used to transfer texture and image data into and out of textures and framebuffers, and may be written to by operations such as transform feedback. OpenGL contains mechanisms to copy sections of buffers from one to another, but it has no mechanism to initialize the content of a buffer to a known value. In effect, it has memcpy, but not memset.
This extension adds such a mechanism and has several use cases. Examples include clearing a pixel unpack buffer before transferring data to a texture or resetting buffer data to a known value before sparse updates through shader image stores or transform feedback.
The official definition of this extension is available here:


glClearBufferData( target , internalformat , format , type , data )
glClearBufferSubData( target , internalformat , offset , size , format , type , data )