The python scripting API does not provide a class PCB_TARGET

[LordBlick]

>>> brd=pcbnew
>>> for StrAttr in dir(brd):
... if StrAttr.startswith('PCB'):
... print(StrAttr)
...
PCB_IO
PCB_IO_swigregister
PCB_PLOT_PARAMS
PCB_PLOT_PARAMS_GetGerberDefaultPrecision
PCB_PLOT_PARAMS_PARSER
PCB_PLOT_PARAMS_PARSER_swigregister
PCB_PLOT_PARAMS_swigregister
Additionally, pcb enumeration method pcb.GetDrawings() returns None in this object case.
Open attachment and paste in python console (same commands without leading spaces, prompt '>>>' or '... '):
>>> brd=pcbnew
>>> pcb=brd.GetBoard()
>>> draws=list(pcb.GetDrawings())
>>> for n in range(len(draws)):
... print("Draw[%i]:%s" % (n, draws[n]))
...
Draw[0]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f9d8da2a1e0> >
Draw[1]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f9d8da2a270> >
Draw[2]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f9d8da2a1b0> >
Draw[3]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f9d8da2a2a0> >
Draw[4]:None
>>>

Application: pcbnew
Version: (2014-jul-16 BZR unknown)-BZR5173 Release build
wxWidgets: Version 3.0.0 (release,wchar_t,compiler with C++ ABI 1002,GCC 4.8.3,wx containers,compatible with 2.8)
Platform: Linux 3.16.3-1 x86_64, 64 bit, Little endian, wxGTK
Boost version: 1.55.0
         USE_WX_GRAPHICS_CONTEXT=OFF
         USE_WX_OVERLAY=OFF
         KICAD_SCRIPTING=ON
         KICAD_SCRIPTING_MODULES=ON
         KICAD_SCRIPTING_WXPYTHON=ON
         USE_FP_LIB_TABLE=HARD_CODED_ON
         BUILD_GITHUB_PLUGIN=OFF

Required source C++ class is from pcbnew/class_mire.cpp
47:PCB_TARGET::PCB_TARGET( BOARD_ITEM* aParent ) :

[LordBlick (lordblick)]

I don't know why, but initial message drops attachment.

[LordBlick (lordblick)]

After patching with attachment, solution is half-succeed - we have got required class, but pcb enumeration method pcb.GetDrawings() still gives None instead PCB_TARGET object.
pcb.GetDrawings() is buried wraper of:
DLIST<BOARD_ITEM> m_Drawings;
pcbnew/class_board.h:239

[LordBlick (lordblick)]

Some log for attached earlier file:
Welcome To PyCrust 0.9.8 - KiCAD Python Shell
Python 2.7.8 (default, Jul 18 2014, 10:11:56)
[GCC 4.8.3 20140522 (release)] on linux2
Type "help", "copyright", "credits" or "license" for more information.
Startup script executed: /home/users/LordBlick/.config/python/pystartup
>>> brd=pcbnew
>>> pcb=brd.GetBoard()
>>> for n, draw in enumerate(pcb.GetDrawings()):
... print("Draw[%i]:%s" % (n, draw))
...
Draw[0]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f22fb86e1b0> >
Draw[1]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f22fb86e210> >
Draw[2]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f22fb86e120> >
Draw[3]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f22fb86e1b0> >
Warning: Uncatched Cast() to EDA_ITEM
Draw[4]:None
>>>

[LordBlick (lordblick)]

OK, final patch…
>>> brd=pcbnew
>>> pcb=brd.GetBoard()
>>> for n, draw in enumerate(pcb.GetDrawings()):
... print("Draw[%i]:%s" % (n, draw))
...
Draw[0]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f8e478c51b0> >
Draw[1]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f8e478c5210> >
Draw[2]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f8e478c5120> >
Draw[3]:<pcbnew.DRAWSEGMENT; proxy of <Swig Object of type 'DRAWSEGMENT *' at 0x7f8e478c51b0> >
Draw[4]:<pcbnew.PCB_TARGET; proxy of <Swig Object of type 'PCB_TARGET *' at 0x7f8e478c5180> >
>>>

[LordBlick (lordblick)]

Commited in http://bazaar.launchpad.net/~kicad-product-committers/kicad/product/revision/5178