--- a/src/if_python.c
+++ b/src/if_python.c
@@ -103,6 +103,7 @@ struct PyMethodDef { Py_ssize_t a; };
 # define PyIntIntObjArgProc intintobjargproc
 # define Py_ssize_t_fmt "i"
 #endif
+#define Py_bytes_fmt "s"
 
 /* Parser flags */
 #define single_input	256
@@ -187,6 +188,7 @@ struct PyMethodDef { Py_ssize_t a; };
 # define PySequence_Check dll_PySequence_Check
 # define PySequence_Size dll_PySequence_Size
 # define PySequence_GetItem dll_PySequence_GetItem
+# define PySequence_Fast dll_PySequence_Fast
 # define PyTuple_Size dll_PyTuple_Size
 # define PyTuple_GetItem dll_PyTuple_GetItem
 # define PyTuple_Type (*dll_PyTuple_Type)
@@ -207,6 +209,7 @@ struct PyMethodDef { Py_ssize_t a; };
 # define PyRun_SimpleString dll_PyRun_SimpleString
 # define PyRun_String dll_PyRun_String
 # define PyObject_GetAttrString dll_PyObject_GetAttrString
+# define PyObject_HasAttrString dll_PyObject_HasAttrString
 # define PyObject_SetAttrString dll_PyObject_SetAttrString
 # define PyObject_CallFunctionObjArgs dll_PyObject_CallFunctionObjArgs
 # define PyString_AsString dll_PyString_AsString
@@ -227,6 +230,7 @@ struct PyMethodDef { Py_ssize_t a; };
 # define PySys_SetArgv dll_PySys_SetArgv
 # define PyType_Type (*dll_PyType_Type)
 # define PyType_Ready (*dll_PyType_Ready)
+# define PyType_GenericAlloc dll_PyType_GenericAlloc
 # define Py_BuildValue dll_Py_BuildValue
 # define Py_FindMethod dll_Py_FindMethod
 # define Py_InitModule4 dll_Py_InitModule4
@@ -318,6 +322,7 @@ static PyTypeObject* dll_PyList_Type;
 static int (*dll_PySequence_Check)(PyObject *);
 static PyInt(*dll_PySequence_Size)(PyObject *);
 static PyObject*(*dll_PySequence_GetItem)(PyObject *, PyInt);
+static PyObject*(*dll_PySequence_Fast)(PyObject *, const char *);
 static PyInt(*dll_PyTuple_Size)(PyObject *);
 static PyObject*(*dll_PyTuple_GetItem)(PyObject *, PyInt);
 static PyTypeObject* dll_PyTuple_Type;
@@ -336,6 +341,7 @@ static PyObject*(*dll_PyModule_GetDict)(
 static int(*dll_PyRun_SimpleString)(char *);
 static PyObject *(*dll_PyRun_String)(char *, int, PyObject *, PyObject *);
 static PyObject* (*dll_PyObject_GetAttrString)(PyObject *, const char *);
+static int (*dll_PyObject_HasAttrString)(PyObject *, const char *);
 static PyObject* (*dll_PyObject_SetAttrString)(PyObject *, const char *, PyObject *);
 static PyObject* (*dll_PyObject_CallFunctionObjArgs)(PyObject *, ...);
 static char*(*dll_PyString_AsString)(PyObject *);
@@ -354,6 +360,7 @@ static int(*dll_PySys_SetObject)(char *,
 static int(*dll_PySys_SetArgv)(int, char **);
 static PyTypeObject* dll_PyType_Type;
 static int (*dll_PyType_Ready)(PyTypeObject *type);
+static PyObject* (*dll_PyType_GenericAlloc)(PyTypeObject *type, PyInt nitems);
 static PyObject*(*dll_Py_BuildValue)(char *, ...);
 static PyObject*(*dll_Py_FindMethod)(struct PyMethodDef[], PyObject *, char *);
 static PyObject*(*dll_Py_InitModule4)(char *, struct PyMethodDef *, char *, PyObject *, int);
@@ -475,9 +482,10 @@ static struct
     {"PyList_SetItem", (PYTHON_PROC*)&dll_PyList_SetItem},
     {"PyList_Size", (PYTHON_PROC*)&dll_PyList_Size},
     {"PyList_Type", (PYTHON_PROC*)&dll_PyList_Type},
-    {"PySequence_GetItem", (PYTHON_PROC*)&dll_PySequence_GetItem},
     {"PySequence_Size", (PYTHON_PROC*)&dll_PySequence_Size},
     {"PySequence_Check", (PYTHON_PROC*)&dll_PySequence_Check},
+    {"PySequence_GetItem", (PYTHON_PROC*)&dll_PySequence_GetItem},
+    {"PySequence_Fast", (PYTHON_PROC*)&dll_PySequence_Fast},
     {"PyTuple_GetItem", (PYTHON_PROC*)&dll_PyTuple_GetItem},
     {"PyTuple_Size", (PYTHON_PROC*)&dll_PyTuple_Size},
     {"PyTuple_Type", (PYTHON_PROC*)&dll_PyTuple_Type},
@@ -496,6 +504,7 @@ static struct
     {"PyRun_SimpleString", (PYTHON_PROC*)&dll_PyRun_SimpleString},
     {"PyRun_String", (PYTHON_PROC*)&dll_PyRun_String},
     {"PyObject_GetAttrString", (PYTHON_PROC*)&dll_PyObject_GetAttrString},
+    {"PyObject_HasAttrString", (PYTHON_PROC*)&dll_PyObject_HasAttrString},
     {"PyObject_SetAttrString", (PYTHON_PROC*)&dll_PyObject_SetAttrString},
     {"PyObject_CallFunctionObjArgs", (PYTHON_PROC*)&dll_PyObject_CallFunctionObjArgs},
     {"PyString_AsString", (PYTHON_PROC*)&dll_PyString_AsString},
@@ -514,6 +523,7 @@ static struct
     {"PySys_SetArgv", (PYTHON_PROC*)&dll_PySys_SetArgv},
     {"PyType_Type", (PYTHON_PROC*)&dll_PyType_Type},
     {"PyType_Ready", (PYTHON_PROC*)&dll_PyType_Ready},
+    {"PyType_GenericAlloc", (PYTHON_PROC*)&dll_PyType_GenericAlloc},
     {"Py_FindMethod", (PYTHON_PROC*)&dll_Py_FindMethod},
     {"Py_SetPythonHome", (PYTHON_PROC*)&dll_Py_SetPythonHome},
     {"Py_Initialize", (PYTHON_PROC*)&dll_Py_Initialize},
@@ -1116,10 +1126,8 @@ static PySequenceMethods BufferAsSeq = {
     (PyIntObjArgProc)	BufferAssItem,	    /* sq_ass_item,  x[i]=v   */
     (PyIntIntObjArgProc) BufferAssSlice,    /* sq_ass_slice, x[i:j]=v */
     (objobjproc)	0,
-#if PY_MAJOR_VERSION >= 2
     (binaryfunc)	0,
     0,
-#endif
 };
 
 /* Buffer object - Implementation