diff --git a/hplip/pcard/pcardext/pcardext.c b/hplip/pcard/pcardext/pcardext.c

index 131e5e953..24077305f 100644

--- a/hplip/pcard/pcardext/pcardext.c

+++ b/hplip/pcard/pcardext/pcardext.c

@@ -20,7 +20,7 @@ pcardext - Python extension for HP photocard services

 Requires:

 Python 2.2+

-Author: Don Welch

+Author: Don Welch 

 \*****************************************************************************/

@@ -41,9 +41,37 @@ typedef int Py_ssize_t;

 int verbose=0;

+#if PY_MAJOR_VERSION >= 3

+  #define MOD_ERROR_VAL NULL

+  #define MOD_SUCCESS_VAL(val) val

+  #define MOD_INIT(name) PyMODINIT_FUNC PyInit_##name(void)

+  #define PyInt_AS_LONG PyLong_AS_LONG

+  #define MOD_DEF(ob, name, doc, methods) \

+          static struct PyModuleDef moduledef = { \

+            PyModuleDef_HEAD_INIT, name, doc, -1, methods, }; \

+          ob = PyModule_Create(&moduledef);

+

+

+  #define PY_String_Bytes  PyBytes_FromStringAndSize

+  #define PY_AsString_Bytes  PyBytes_AsStringAndSize

+

+#else

+  #define MOD_ERROR_VAL

+  #define MOD_SUCCESS_VAL(val)

+  #define MOD_INIT(name) void init##name(void)

+  #define MOD_DEF(ob, name, doc, methods)         \

+        ob = Py_InitModule3(name, methods, doc);

+

+  #define PY_String_Bytes PyString_FromStringAndSize

+  #define PY_AsString_Bytes PyString_AsStringAndSize

+  

+#endif

+

 PyObject * readsectorFunc = NULL;

 PyObject * writesectorFunc = NULL;

+

+

 int ReadSector(int sector, int nsector, void *buf, int size)

 {

     PyObject * result;

@@ -59,9 +87,13 @@ int ReadSector(int sector, int nsector, void *buf, int size)

         if( result )

         {

             Py_ssize_t len = 0;

-            PyString_AsStringAndSize( result, &result_str, &len );

+

+            //PyString_AsStringAndSize( result, &result_str, &len );    

+            //PyBytes_AsStringAndSize( result, &result_str, &len ); 

+            PY_AsString_Bytes( result, &result_str, &len );

-            if( len < nsector*FAT_HARDSECT )

+

+	    if( len < nsector*FAT_HARDSECT )

             {

                 goto abort;

             }

@@ -208,7 +240,9 @@ PyObject * pcardext_read( PyObject * self, PyObject * args )

     if( FatReadFileExt( name, offset, len, buffer ) == len )

     {

-        return PyString_FromStringAndSize( (char *)buffer, len );

+        // return PyString_FromStringAndSize( (char *)buffer, len );

+        return PY_String_Bytes( (char *)buffer, len );

+        // return PyBytes_FromStringAndSize( (char *)buffer, len );

     }

     else

     {

@@ -236,14 +270,15 @@ static PyMethodDef pcardext_methods[] =

 static char pcardext_documentation[] = "Python extension for HP photocard services";

-void initpcardext( void )

-{

-    PyObject * mod = Py_InitModule4( "pcardext", pcardext_methods, 

-                                     pcardext_documentation, (PyObject*)NULL, 

-                                     PYTHON_API_VERSION );

-                     

-    if (mod == NULL)

-      return;

+MOD_INIT(pcardext)  {

+

+  PyObject* mod ;

+  MOD_DEF(mod, "pcardext", pcardext_documentation, pcardext_methods);

+  if (mod == NULL)

+    return MOD_ERROR_VAL;

+

+  return MOD_SUCCESS_VAL(mod);

+

 }

diff --git a/hplip/unload.py b/hplip/unload.py

index 3fdd5a381..ce8b069c9 100755

--- a/hplip/unload.py

+++ b/hplip/unload.py

@@ -44,6 +44,11 @@ except ImportError:

 # Local

 from base.g import *

+from base.sixext import PY3

+if PY3:

+    log.error("This functionality is not spported in python3 environment.")

+    sys.exit(1)

+

 from base import device, utils, tui, module

 from prnt import cups