/usr/include/python2.7_d/ is in libpython2.7-dbg 2.7.13-2+deb9u3.
This file is owned by root:root, with mode 0o755.
..
/usr/include/python2.7_d/Python-ast.h
/usr/include/python2.7_d/Python.h
/usr/include/python2.7_d/abstract.h
/usr/include/python2.7_d/asdl.h
/usr/include/python2.7_d/ast.h
/usr/include/python2.7_d/bitset.h
/usr/include/python2.7_d/boolobject.h
/usr/include/python2.7_d/bufferobject.h
/usr/include/python2.7_d/bytearrayobject.h
/usr/include/python2.7_d/bytes_methods.h
/usr/include/python2.7_d/bytesobject.h
/usr/include/python2.7_d/cStringIO.h
/usr/include/python2.7_d/cellobject.h
/usr/include/python2.7_d/ceval.h
/usr/include/python2.7_d/classobject.h
/usr/include/python2.7_d/cobject.h
/usr/include/python2.7_d/code.h
/usr/include/python2.7_d/codecs.h
/usr/include/python2.7_d/compile.h
/usr/include/python2.7_d/complexobject.h
/usr/include/python2.7_d/datetime.h
/usr/include/python2.7_d/descrobject.h
/usr/include/python2.7_d/dictobject.h
/usr/include/python2.7_d/dtoa.h
/usr/include/python2.7_d/enumobject.h
/usr/include/python2.7_d/errcode.h
/usr/include/python2.7_d/eval.h
/usr/include/python2.7_d/fileobject.h
/usr/include/python2.7_d/floatobject.h
/usr/include/python2.7_d/frameobject.h
/usr/include/python2.7_d/funcobject.h
/usr/include/python2.7_d/genobject.h
/usr/include/python2.7_d/graminit.h
/usr/include/python2.7_d/grammar.h
/usr/include/python2.7_d/import.h
/usr/include/python2.7_d/intobject.h
/usr/include/python2.7_d/intrcheck.h
/usr/include/python2.7_d/iterobject.h
/usr/include/python2.7_d/listobject.h
/usr/include/python2.7_d/longintrepr.h
/usr/include/python2.7_d/longobject.h
/usr/include/python2.7_d/marshal.h
/usr/include/python2.7_d/memoryobject.h
/usr/include/python2.7_d/metagrammar.h
/usr/include/python2.7_d/methodobject.h
/usr/include/python2.7_d/modsupport.h
/usr/include/python2.7_d/moduleobject.h
/usr/include/python2.7_d/node.h
/usr/include/python2.7_d/object.h
/usr/include/python2.7_d/objimpl.h
/usr/include/python2.7_d/opcode.h
/usr/include/python2.7_d/osdefs.h
/usr/include/python2.7_d/parsetok.h
/usr/include/python2.7_d/patchlevel.h
/usr/include/python2.7_d/pgen.h
/usr/include/python2.7_d/pgenheaders.h
/usr/include/python2.7_d/py_curses.h
/usr/include/python2.7_d/pyarena.h
/usr/include/python2.7_d/pycapsule.h
/usr/include/python2.7_d/pyconfig.h
/usr/include/python2.7_d/pyctype.h
/usr/include/python2.7_d/pydebug.h
/usr/include/python2.7_d/pyerrors.h
/usr/include/python2.7_d/pyexpat.h
/usr/include/python2.7_d/pyfpe.h
/usr/include/python2.7_d/pygetopt.h
/usr/include/python2.7_d/pymacconfig.h
/usr/include/python2.7_d/pymactoolbox.h
/usr/include/python2.7_d/pymath.h
/usr/include/python2.7_d/pymem.h
/usr/include/python2.7_d/pyport.h
/usr/include/python2.7_d/pystate.h
/usr/include/python2.7_d/pystrcmp.h
/usr/include/python2.7_d/pystrtod.h
/usr/include/python2.7_d/pythonrun.h
/usr/include/python2.7_d/pythread.h
/usr/include/python2.7_d/rangeobject.h
/usr/include/python2.7_d/setobject.h
/usr/include/python2.7_d/sliceobject.h
/usr/include/python2.7_d/stringobject.h
/usr/include/python2.7_d/structmember.h
/usr/include/python2.7_d/structseq.h
/usr/include/python2.7_d/symtable.h
/usr/include/python2.7_d/sysmodule.h
/usr/include/python2.7_d/timefuncs.h
/usr/include/python2.7_d/token.h
/usr/include/python2.7_d/traceback.h
/usr/include/python2.7_d/tupleobject.h
/usr/include/python2.7_d/ucnhash.h
/usr/include/python2.7_d/unicodeobject.h
/usr/include/python2.7_d/warnings.h
/usr/include/python2.7_d/weakrefobject.h