These are simple bindings for glx.
Most functions from <GL/glx.h> are bound. The main exceptions are the extensions. If you desire to use those, then you should query them with glx.QueryExtension(), and load them with glx.GetProcAddress().
Two common and extremely useful extensions, glx.CreateContextAttribsARB() and glx.SwapIntervalEXT() can be loaded by calling glx.load_common_extensions().