Hi,
thanks for great project.
I am testing this in Lazarus:

Lazarus version: 1.7
Lazarus svn revision: 54250M
Lazarus build date: 2018/05/11
Lazarus was compiled for i386-win32 on win7 64bit
Lazarus was compiled with fpc 3.1.1

Seems like

function  PyPoint_OffsetBy(self, args : PPyObject) : PPyObject; cdecl; 

is not properly registered and python code:

p.OffsetBy( 5, 5 )

causes Access violation error.
I am able to run demo01 without problem and using embedded distribution downloaded from python.org.
For details please see: