Notable P4D features that can be useful for optimi...

Notable P4D features that can be useful for optimization (reducing nested typecasting):

text
PyImport_FrozenModules: PP_frozen;

    Py_None:            PPyObject;
    Py_Ellipsis:        PPyObject;
    Py_False:           PPyObject;
    Py_True:            PPyObject;
    Py_NotImplemented:  PPyObject;

    PyExc_AttributeError: PPPyObject;
    PyExc_EOFError: PPPyObject;
    PyExc_IOError: PPPyObject;
    PyExc_ImportError: PPPyObject;
    PyExc_IndexError: PPPyObject;
    PyExc_KeyError: PPPyObject;
    PyExc_KeyboardInterrupt: PPPyObject;
    PyExc_MemoryError: PPPyObject;
    PyExc_NameError: PPPyObject;
    PyExc_OverflowError: PPPyObject;
    PyExc_RuntimeError: PPPyObject;
    PyExc_SyntaxError: PPPyObject;
    PyExc_SystemError: PPPyObject;
    PyExc_SystemExit: PPPyObject;
    PyExc_TypeError: PPPyObject;
    PyExc_ValueError: PPPyObject;
    PyExc_ZeroDivisionError: PPPyObject;
    PyExc_ArithmeticError: PPPyObject;
    PyExc_Exception: PPPyObject;
    PyExc_FloatingPointError: PPPyObject;
    PyExc_LookupError: PPPyObject;
    PyExc_AssertionError: PPPyObject;
    PyExc_EnvironmentError: PPPyObject;
    PyExc_IndentationError: PPPyObject;
    PyExc_NotImplementedError: PPPyObject;
    PyExc_OSError: PPPyObject;
    PyExc_TabError: PPPyObject;
    PyExc_UnboundLocalError: PPPyObject;
    PyExc_UnicodeError: PPPyObject;
 {$IFDEF MSWINDOWS}
    PyExc_WindowsError: PPPyObject;
 {$ENDIF}
    PyExc_Warning: PPPyObject;
    PyExc_DeprecationWarning: PPPyObject;
    PyExc_RuntimeWarning: PPPyObject;
    PyExc_SyntaxWarning: PPPyObject;
    PyExc_UserWarning: PPPyObject;
    PyExc_ReferenceError: PPPyObject;
    PyExc_StopIteration: PPPyObject;
    PyExc_FutureWarning: PPPyObject;
    PyExc_PendingDeprecationWarning: PPPyObject;
    PyExc_UnicodeDecodeError: PPPyObject;
    PyExc_UnicodeEncodeError: PPPyObject;
    PyExc_UnicodeTranslateError: PPPyObject;
    PyExc_BufferError: PPPyObject;

    PyCode_Type: PPyTypeObject;
    PyType_Type: PPyTypeObject;
    PyCFunction_Type: PPyTypeObject;
    PyComplex_Type: PPyTypeObject;
    PyDict_Type: PPyTypeObject;
    PyFloat_Type: PPyTypeObject;
    PyFrame_Type: PPyTypeObject;
    PyFunction_Type: PPyTypeObject;
    PyList_Type: PPyTypeObject;
    PyLong_Type: PPyTypeObject;
    PyMethod_Type: PPyTypeObject;
    PyModule_Type: PPyTypeObject;
    PyObject_Type: PPyTypeObject;
    PyRange_Type: PPyTypeObject;
    PySlice_Type: PPyTypeObject;
    PyBytes_Type: PPyTypeObject;
    PyByteArray_Type: PPyTypeObject;
    PyTuple_Type: PPyTypeObject;
    PyBaseObject_Type: PPyTypeObject;
    PyCallIter_Type: PPyTypeObject;
    PyCell_Type: PPyTypeObject;
    PyClassMethod_Type: PPyTypeObject;
    PyProperty_Type: PPyTypeObject;
    PySeqIter_Type: PPyTypeObject;
    PyStaticMethod_Type: PPyTypeObject;
    PySuper_Type: PPyTypeObject;
    PyTraceBack_Type: PPyTypeObject;
    PyUnicode_Type: PPyTypeObject;
    PyWrapperDescr_Type: PPyTypeObject;
    _PyWeakref_RefType: PPyTypeObject;
    _PyWeakref_ProxyType: PPyTypeObject;
    _PyWeakref_CallableProxyType: PPyTypeObject;
    PyBool_Type: PPyTypeObject;
    PyEnum_Type: PPyTypeObject;
    PySet_Type: PPyTypeObject;
    PyFrozenSet_Type: PPyTypeObject;

    Py_GetBuildInfo: function : PAnsiChar; cdecl;
    PyImport_ExecCodeModule: function ( const name : AnsiString; codeobject : PPyObject) : PPyObject; cdecl;
    PyComplex_FromCComplex: function(c: Py_complex):PPyObject; cdecl;
    PyComplex_FromDoubles: function(realv,imag : double):PPyObject; cdecl;
    PyComplex_RealAsDouble: function(op : PPyObject ): double; cdecl;
    PyComplex_ImagAsDouble: function(op : PPyObject ): double; cdecl;
    PyComplex_AsCComplex: function(op : PPyObject ): Py_complex; cdecl;
    PyCFunction_GetFunction: function(ob : PPyObject): Pointer; cdecl;
    PyCFunction_GetSelf: function(ob : PPyObject): PPyObject; cdecl;
    PyCallable_Check: function(ob	: PPyObject): integer; cdecl;

    PyModule_Create2:   function(moduledef: PPyModuleDef; Api_Version: Integer):PPyObject; cdecl;
    PyErr_BadArgument:  function: integer; cdecl;
    PyErr_BadInternalCall: procedure; cdecl;
    PyErr_CheckSignals: function: integer; cdecl;
    PyErr_Clear:        procedure; cdecl;
    PyErr_Fetch:        procedure(out errtype, errvalue, errtraceback: PPyObject); cdecl;
    PyErr_NoMemory:     function: PPyObject; cdecl;
    PyErr_Occurred:     function: PPyObject; cdecl;
    PyErr_Print:        procedure; cdecl;
    PyErr_Restore:      procedure  (errtype, errvalue, errtraceback: PPyObject); cdecl;
    PyErr_SetFromErrno: function (ob :  PPyObject):PPyObject; cdecl;
    PyErr_SetNone:      procedure(value: PPyObject); cdecl;
    PyErr_SetObject:    procedure  (ob1, ob2	: PPyObject); cdecl;
    PyErr_SetString:    procedure( ErrorObject: PPyObject; text: PAnsiChar); cdecl;
    PyErr_WarnEx:       function (ob: PPyObject; text: PAnsiChar; stack_level: NativeInt): integer; cdecl;
    PyErr_WarnExplicit: function (ob: PPyObject; text: PAnsiChar; filename: PAnsiChar; lineno: integer; module: PAnsiChar; registry: PPyObject): integer; cdecl;
    PyImport_GetModuleDict: function: PPyObject; cdecl;

    PyArg_Parse:        TPyArg_Parse;
    PyArg_ParseTuple:   TPyArg_Parse;
    PyArg_ParseTupleAndKeywords:   TPyArg_ParseTupleAndKeywords;
    Py_BuildValue:      TPy_BuildValue;

    Py_Initialize:      procedure; cdecl;
    Py_Exit:            procedure( RetVal: Integer); cdecl;
    PyEval_GetBuiltins: function: PPyObject; cdecl;
    PyDict_Copy:        function(mp: PPyObject):PPyObject; cdecl;
    PyDict_GetItem:     function(mp, key : PPyObject):PPyObject; cdecl;
    PyDict_SetItem:     function(mp, key, item :PPyObject ):integer; cdecl;
    PyDict_DelItem:     function(mp, key : PPyObject ):integer; cdecl;
    PyDict_Clear:       procedure(mp : PPyObject); cdecl;
    PyDict_Next:        function(mp : PPyObject; pos: PNativeInt; key, value: PPPyObject):integer; cdecl;
    PyDict_Keys:        function(mp: PPyObject):PPyObject; cdecl;
    PyDict_Values:      function(mp: PPyObject):PPyObject; cdecl;
    PyDict_Items:       function(mp: PPyObject):PPyObject; cdecl;
    PyDict_Size:        function(mp: PPyObject):NativeInt; cdecl;
    PyDict_Update:      function (a: PPyObject; b: PPyObject):Integer; cdecl;
    PyDict_DelItemString: function(dp : PPyObject;key : PAnsiChar ):integer; cdecl;
    PyDict_New: function: PPyObject; cdecl;
    PyDict_GetItemString: function( dp: PPyObject; key: PAnsiChar): PPyObject; cdecl;
    PyDict_SetItemString: function( dp: PPyObject; key: PAnsiChar; item: PPyObject):
                          Integer; cdecl;
    PyDictProxy_New:      function (obj : PPyObject) : PPyObject; cdecl;
    PyModule_GetDict:     function( module:PPyObject): PPyObject; cdecl;
    PyObject_Str:         function( v: PPyObject): PPyObject; cdecl;
    PyRun_String:         function( str: PAnsiChar; start: Integer; globals: PPyObject;
                                    locals: PPyObject): PPyObject; cdecl;
    PyRun_SimpleString:   function( str: PAnsiChar): Integer; cdecl;
    PyBytes_AsString:    function( ob: PPyObject): PAnsiChar; cdecl;
    PyBytes_AsStringAndSize: function( ob: PPyObject; var buffer: PAnsiChar; var size: NativeInt): integer; cdecl;
    PyByteArray_AsString: function(ob: PPyObject): PAnsiChar; cdecl;

    PyCFunction_NewEx: function(md:PPyMethodDef;self, ob:PPyObject):PPyObject; cdecl;

    PyBuffer_GetPointer: function(view: PPy_buffer; indices: PPy_ssize_t): Pointer; cdecl;
    PyBuffer_SizeFromFormat: function(format: PAnsiChar): Py_ssize_t; cdecl; // New in Python 3.9
    PyBuffer_ToContiguous: function(buf: Pointer; view: PPy_buffer; len: Py_ssize_t; order: AnsiChar): Integer; cdecl;
    PyBuffer_FromContiguous: function(view: PPy_buffer; buf: Pointer;  len: Py_ssize_t; order: AnsiChar): Integer; cdecl;
    PyBuffer_IsContiguous: function(view: PPy_buffer; fort: AnsiChar): Integer; cdecl;
    PyBuffer_FillContiguousStrides: procedure(ndims: Integer; shape: Py_ssize_t;
       strides: PPy_ssize_t; itemsize: Integer; fort: AnsiChar); cdecl;
    PyBuffer_FillInfo: function(view: PPy_buffer; o: PPyObject; buf: Pointer;
      len: Py_ssize_t; readonly: Integer; flags: Integer): Integer; cdecl;
    PyBuffer_Release: procedure(view: PPy_buffer); cdecl;

    PyEval_GetFrame:function :PPyObject; cdecl;
    PyEval_GetGlobals:function :PPyObject; cdecl;
    PyEval_GetLocals:function :PPyObject; cdecl;

    PyEval_RestoreThread:procedure( tstate: PPyThreadState); cdecl;
    PyEval_SaveThread:function :PPyThreadState; cdecl;

    PyFile_GetLine:function (ob:PPyObject;i:integer):PPyObject; cdecl;
    PyFile_WriteObject:function (ob1,ob2:PPyObject;i:integer):integer; cdecl;
    PyFile_WriteString:procedure(s:PAnsiChar;ob:PPyObject); cdecl;
    PyFloat_AsDouble:function (ob:PPyObject):DOUBLE; cdecl;
    PyFloat_FromDouble:function (db:double):PPyObject; cdecl;
    PyFloat_FromString:function (str:PPyObject):PPyObject; cdecl;
    PyFunction_GetCode:function (ob:PPyObject):PPyObject; cdecl;
    PyFunction_GetGlobals:function (ob:PPyObject):PPyObject; cdecl;
    PyFunction_New:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyImport_AddModule:function (name:PAnsiChar):PPyObject; cdecl;
    PyImport_GetMagicNumber:function :C_Long; cdecl;
    PyImport_ImportFrozenModule:function (key:PAnsiChar):integer; cdecl;
    PyImport_ImportModule:function (name:PAnsiChar):PPyObject; cdecl;
    PyImport_Import:function (name:PPyObject):PPyObject; cdecl;
    PyImport_ReloadModule:function (ob:PPyObject):PPyObject; cdecl;
    PyList_Append:function (ob1,ob2:PPyObject):integer; cdecl;
    PyList_AsTuple:function (ob:PPyObject):PPyObject; cdecl;
    PyList_GetItem:function (ob:PPyObject;i:NativeInt):PPyObject; cdecl;
    PyList_GetSlice:function (ob:PPyObject;i1,i2:NativeInt):PPyObject; cdecl;
    PyList_Insert:function (dp:PPyObject;idx:NativeInt;item:PPyObject):integer; cdecl;
    PyList_New:function (size:NativeInt):PPyObject; cdecl;
    PyList_Reverse:function (ob:PPyObject):integer; cdecl;
    PyList_SetItem:function (dp:PPyObject;idx:NativeInt;item:PPyObject):integer; cdecl;
    PyList_SetSlice:function (ob:PPyObject;i1,i2:NativeInt;ob2:PPyObject):integer; cdecl;
    PyList_Size:function (ob:PPyObject):NativeInt; cdecl;
    PyList_Sort:function (ob:PPyObject):integer; cdecl;
    PyLong_AsDouble:function (ob:PPyObject):DOUBLE; cdecl;
    PyLong_AsLong:function (ob:PPyObject):C_Long; cdecl;
    PyLong_FromDouble:function (db:double):PPyObject; cdecl;
    PyLong_FromLong:function (l:C_Long):PPyObject; cdecl;
    PyLong_FromString:function (pc:PAnsiChar;var ppc:PAnsiChar;i:integer):PPyObject; cdecl;
    PyLong_FromUnsignedLong:function(val:C_ULong): PPyObject; cdecl;
    PyLong_AsUnsignedLong:function(ob:PPyObject): C_ULong; cdecl;
    PyLong_FromUnicodeObject:function(ob:PPyObject; base : integer): PPyObject; cdecl;
    PyLong_FromLongLong:function(val:Int64): PPyObject; cdecl;
    PyLong_FromUnsignedLongLong:function(val:UInt64) : PPyObject; cdecl;
    PyLong_AsLongLong:function(ob:PPyObject): Int64; cdecl;
    PyLong_FromVoidPtr:function(p: Pointer): PPyObject; cdecl;
    PyMapping_Check:function (ob:PPyObject):integer; cdecl;
    PyMapping_GetItemString:function (ob:PPyObject;key:PAnsiChar):PPyObject; cdecl;
    PyMapping_HasKey:function (ob,key:PPyObject):integer; cdecl;
    PyMapping_HasKeyString:function (ob:PPyObject;key:PAnsiChar):integer; cdecl;
    PyMapping_Length:function (ob:PPyObject):NativeInt; cdecl;
    PyMapping_SetItemString:function (ob:PPyObject; key:PAnsiChar; value:PPyObject):integer; cdecl;
    PyMapping_Keys:function(mp: PPyObject):PPyObject; cdecl;
    PyMapping_Values:function(mp: PPyObject):PPyObject; cdecl;
    PyMethod_Function:function (ob:PPyObject):PPyObject; cdecl;
    PyMethod_New:function (ob1,ob2,ob3:PPyObject):PPyObject; cdecl;
    PyMethod_Self:function (ob:PPyObject):PPyObject; cdecl;
    PyModule_GetName:function (ob:PPyObject):PAnsiChar; cdecl;
    PyModule_New:function (key:PAnsiChar):PPyObject; cdecl;
    PyNumber_Absolute:function (ob:PPyObject):PPyObject; cdecl;
    PyNumber_Add:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_And:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_Check:function (ob:PPyObject):integer; cdecl;
    PyNumber_FloorDivide:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_TrueDivide:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_Divmod:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_Float:function (ob:PPyObject):PPyObject; cdecl;
    PyNumber_Invert:function (ob:PPyObject):PPyObject; cdecl;
    PyNumber_Long:function (ob:PPyObject):PPyObject; cdecl;
    PyNumber_Lshift:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_Multiply:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_Negative:function (ob:PPyObject):PPyObject; cdecl;
    PyNumber_Or:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_Positive:function (ob:PPyObject):PPyObject; cdecl;
    PyNumber_Power:function (ob1,ob2,ob3:PPyObject):PPyObject; cdecl;
    PyNumber_Remainder:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_Rshift:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_Subtract:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyNumber_Xor:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyOS_InterruptOccurred:function :integer; cdecl;
    PyObject_CallObject:function (ob,args:PPyObject):PPyObject; cdecl;
    PyObject_CallMethod : function ( obj : PPyObject; method, format : PAnsiChar {...}) : PPyObject; cdecl varargs;
    PyObject_RichCompare:function (ob1,ob2:PPyObject;opid:integer):PPyObject; cdecl;
    PyObject_RichCompareBool:function (ob1,ob2:PPyObject;opid:integer):Integer; cdecl;
    PyObject_GetAttr:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PyObject_GetAttrString:function (ob:PPyObject;c:PAnsiChar):PPyObject; cdecl;
    PyObject_GetItem:function (ob,key:PPyObject):PPyObject; cdecl;
    PyObject_DelItem:function (ob,key:PPyObject):PPyObject; cdecl;
    PyObject_HasAttr:function (ob, attr_name:PPyObject):integer; cdecl;
    PyObject_HasAttrString:function (ob:PPyObject;key:PAnsiChar):integer; cdecl;
    PyObject_Hash:function (ob:PPyObject):NativeInt; cdecl;
    PyObject_IsTrue:function (ob:PPyObject):integer; cdecl;
    PyObject_Length:function (ob:PPyObject):NativeInt; cdecl;
    PyObject_Repr:function (ob:PPyObject):PPyObject; cdecl;
    PyObject_SetAttr:function (ob1,ob2,ob3:PPyObject):integer; cdecl;
    PyObject_SetAttrString:function (ob:PPyObject;key:PAnsiChar;value:PPyObject):integer; cdecl;
    PyObject_SetItem:function (ob1,ob2,ob3:PPyObject):integer; cdecl;
    PyObject_Init:function (ob:PPyObject; t:PPyTypeObject):PPyObject; cdecl;
    PyObject_InitVar:function (ob:PPyObject; t:PPyTypeObject; size:NativeInt):PPyObject; cdecl;
    PyObject_New:function (t:PPyTypeObject):PPyObject; cdecl;
    PyObject_NewVar:function (t:PPyTypeObject; size:NativeInt):PPyObject; cdecl;
    PyObject_Free:procedure (ob:PPyObject); cdecl;
    PyObject_GetIter: function (obj: PPyObject) : PPyObject; cdecl;
    PyIter_Next: function (obj: PPyObject) : PPyObject; cdecl;
    PyObject_IsInstance:function (inst, cls:PPyObject):integer; cdecl;
    PyObject_IsSubclass:function (derived, cls:PPyObject):integer; cdecl;
    PyObject_Call:function (ob, args, kw:PPyObject):PPyObject; cdecl;
    PyObject_GenericGetAttr:function (obj, name : PPyObject) : PPyObject; cdecl;
    PyObject_GenericSetAttr:function (obj, name, value : PPyObject) : Integer; cdecl;
    PyObject_Malloc:function (size:NativeUInt):PPyObject; cdecl;
    PyObject_GC_New:function (t:PPyTypeObject):PPyObject; cdecl;
    PyObject_GC_NewVar:function (t:PPyTypeObject; size:NativeInt):PPyObject; cdecl;
    PyObject_GC_Resize:function (t:PPyObject; newsize:NativeInt):PPyObject; cdecl;
    PyObject_GC_Del:procedure (ob:PPyObject); cdecl;
    PyObject_GC_Track:procedure (ob:PPyObject); cdecl;
    PyObject_GC_UnTrack:procedure (ob:PPyObject); cdecl;
    PyObject_GetBuffer: function(obj: PPyObject; view: PPy_buffer; flags: Integer): Integer; cdecl;
    PyObject_CopyData: function (dest: PPyObject; src: PPyObject): Integer; cdecl;
    PySequence_Check:function (ob:PPyObject):integer; cdecl;
    PySequence_Concat:function (ob1,ob2:PPyObject):PPyObject; cdecl;
    PySequence_Count:function (ob1,ob2:PPyObject):integer; cdecl;
    PySequence_GetItem:function (ob:PPyObject;i:NativeInt):PPyObject; cdecl;
    PySequence_GetSlice:function (ob:PPyObject;i1,i2:NativeInt):PPyObject; cdecl;
    PySequence_In:function (ob1,ob2:PPyObject):integer; cdecl;
    PySequence_Index:function (ob1,ob2:PPyObject):NativeInt; cdecl;
    PySequence_Length:function (ob:PPyObject):NativeInt; cdecl;
    PySequence_Repeat:function (ob:PPyObject;count:NativeInt):PPyObject; cdecl;
    PySequence_SetItem:function (ob:PPyObject;i:NativeInt;value:PPyObject):integer; cdecl;
    PySequence_SetSlice:function (ob:PPyObject;i1,i2:NativeInt;value:PPyObject):integer; cdecl;
    PySequence_DelSlice:function (ob:PPyObject;i1,i2:NativeInt):integer; cdecl;
    PySequence_Tuple:function (ob:PPyObject):PPyObject; cdecl;
    PySequence_Contains:function (ob, value:PPyObject):integer; cdecl;
    PySequence_List:function (o:PPyObject):PPyObject; cdecl;
    PySeqIter_New: function(obj : PPyObject) : PPyObject; cdecl;
    PySlice_GetIndices:function (ob:PPySliceObject;length:NativeInt;var start,stop,step:NativeInt):integer; cdecl;
    PySlice_GetIndicesEx:function (ob:PPySliceObject;length:NativeInt;var start,stop,step,slicelength:NativeInt):integer; cdecl;
    PySlice_New:function (start,stop,step:PPyObject):PPyObject; cdecl;
    PyBytes_Concat:procedure(var ob1:PPyObject;ob2:PPyObject); cdecl;
    PyBytes_ConcatAndDel:procedure(var ob1:PPyObject;ob2:PPyObject); cdecl;
    PyBytes_FromString:function (s:PAnsiChar):PPyObject; cdecl;
    PyBytes_FromStringAndSize:function (s:PAnsiChar;i:NativeInt):PPyObject; cdecl;
    PyBytes_Size:function (ob:PPyObject):NativeInt; cdecl;
    PyBytes_DecodeEscape:function(s:PAnsiChar; len:NativeInt; errors:PAnsiChar; unicode:NativeInt; recode_encoding:PAnsiChar):PPyObject; cdecl;
    PyBytes_Repr:function(ob:PPyObject; smartquotes:integer):PPyObject; cdecl;
    PyBytes_FromObject: function(ob:PPyObject): PPyObject; cdecl;
    PyByteArray_Concat: procedure(var ob1: PPyObject; ob2: PPyObject); cdecl;
    PyByteArray_Resize: procedure(var ob1: PPyObject; len: Py_ssize_t); cdecl;
    PyByteArray_FromObject: function(ob:PPyObject): PPyObject; cdecl;
    PyByteArray_FromStringAndSize: function(s: PAnsiChar; i: Py_ssize_t): PPyObject; cdecl;
    PyByteArray_Size: function(ob: PPyObject): Py_ssize_t; cdecl;
    PyFrozenSet_New: function(iterable: PPyObject): PPyObject; cdecl;
    PySet_New: function(iterable: PPyObject): PPyObject; cdecl;
    PySet_Add: function(aset, key: PPyObject): Integer; cdecl;
    PySet_Clear: function(aset: PPyObject): Integer; cdecl;
    PySet_Contains: function(anyset, key: PPyObject): Integer; cdecl;
    PySet_Discard: function(aset, key: PPyObject): Integer; cdecl;
    PySet_Pop: function(aset: PPyObject): PPyObject; cdecl;
    PySet_Size: function(anyset: PPyObject): Py_ssize_t; cdecl;
    PySys_GetObject:function (s:PAnsiChar):PPyObject; cdecl;
    PySys_SetObject:function (s:PAnsiChar;ob:PPyObject):integer; cdecl;
    PyTraceBack_Here:function (p:pointer):integer; cdecl;
    PyTraceBack_Print:function (ob1,ob2:PPyObject):integer; cdecl;
    PyTuple_GetItem:function (ob:PPyObject;i:NativeInt):PPyObject; cdecl;
    PyTuple_GetSlice:function (ob:PPyObject;i1,i2:NativeInt):PPyObject; cdecl;
    PyTuple_New:function (size:NativeInt):PPyObject; cdecl;
    PyTuple_SetItem:function (ob:PPyObject;key:NativeInt;value:PPyObject):integer; cdecl;
    PyTuple_Size:function (ob:PPyObject):NativeInt; cdecl;
    PyType_IsSubtype:function (a, b : PPyTypeObject):integer; cdecl;
    PyType_GenericAlloc:function(atype: PPyTypeObject; nitems:NativeInt) : PPyObject; cdecl;
    PyType_GenericNew:function(atype: PPyTypeObject; args, kwds : PPyObject) : PPyObject; cdecl;
    PyType_Ready:function(atype: PPyTypeObject) : integer; cdecl;
    PyUnicode_FromWideChar:function (const w:PWCharT; size:NativeInt):PPyObject; cdecl;
    PyUnicode_FromString:function (s:PAnsiChar):PPyObject; cdecl;
    PyUnicode_FromStringAndSize:function (s:PAnsiChar;i:NativeInt):PPyObject; cdecl;
    PyUnicode_FromKindAndData:function (kind:integer;const buffer:pointer;size:NativeInt):PPyObject; cdecl;
    PyUnicode_AsWideChar:function (unicode: PPyObject; w:PWCharT; size:NativeInt):integer; cdecl;
    PyUnicode_AsUTF8:function (unicode: PPyObject):PAnsiChar; cdecl;
    PyUnicode_AsUTF8AndSize:function (unicode: PPyObject; size: PNativeInt):PAnsiChar; cdecl;
    PyUnicode_Decode:function (const s:PAnsiChar; size: NativeInt; const encoding : PAnsiChar; const errors: PAnsiChar):PPyObject; cdecl;
    PyUnicode_DecodeUTF16:function (const s:PAnsiChar; size: NativeInt; const errors: PAnsiChar; byteoder: PInteger):PPyObject; cdecl;
    PyUnicode_AsEncodedString:function (unicode:PPyObject; const encoding:PAnsiChar; const errors:PAnsiChar):PPyObject; cdecl;
    PyUnicode_FromOrdinal:function (ordinal:integer):PPyObject; cdecl;
    PyUnicode_GetLength:function (unicode:PPyObject):NativeInt; cdecl;
    PyWeakref_GetObject: function ( ref : PPyObject) : PPyObject; cdecl;
    PyWeakref_NewProxy: function ( ob, callback : PPyObject) : PPyObject; cdecl;
    PyWeakref_NewRef: function ( ob, callback : PPyObject) : PPyObject; cdecl;
    PyWrapper_New: function ( ob1, ob2 : PPyObject) : PPyObject; cdecl;
    PyBool_FromLong: function ( ok : Integer) : PPyObject; cdecl;
    PyThreadState_SetAsyncExc: function(t_id:C_ULong; exc:PPyObject) : Integer; cdecl;
    Py_AtExit:function (proc: AtExitProc):integer; cdecl;
    Py_CompileStringExFlags:function (str,filename:PAnsiChar;start:integer;flags:PPyCompilerFlags;optimize:integer):PPyObject; cdecl;
    Py_FatalError:procedure(s:PAnsiChar); cdecl;
    _PyObject_New:function (obt:PPyTypeObject;ob:PPyObject):PPyObject; cdecl;
    _PyBytes_Resize:function (var ob:PPyObject;i:NativeInt):integer; cdecl;
    Py_Finalize                     : procedure; cdecl;
    PyErr_ExceptionMatches          : function ( exc : PPyObject) : Integer; cdecl;
    PyErr_GivenExceptionMatches     : function ( raised_exc, exc : PPyObject) : Integer; cdecl;
    PyEval_EvalCode                 : function ( co : PPyObject; globals, locals : PPyObject) : PPyObject; cdecl;
    Py_GetVersion                   : function : PAnsiChar; cdecl;
    Py_GetCopyright                 : function : PAnsiChar; cdecl;
    Py_GetExecPrefix                : function : PWCharT; cdecl;
    Py_GetPath                      : function : PWCharT; cdecl;
    Py_GetPythonHome                : function : PWCharT; cdecl;
    Py_GetPrefix                    : function : PWCharT; cdecl;
    Py_GetProgramName               : function : PWCharT; cdecl;

    PyErr_NewException              : function ( name : PAnsiChar; base, dict : PPyObject ) : PPyObject; cdecl;
    PyMem_Malloc                    : function ( size : NativeUInt ) : Pointer;

    Py_IsInitialized                : function : integer; cdecl;
    Py_GetProgramFullPath           : function : PAnsiChar; cdecl;
    Py_NewInterpreter               : function : PPyThreadState; cdecl;
    Py_NewInterpreterFromConfig     : function( tstate: PPyThreadState; config: PPyInterpreterConfig): PyStatus; cdecl;
    Py_EndInterpreter               : procedure( tstate: PPyThreadState); cdecl;
    PyEval_AcquireThread            : procedure( tstate: PPyThreadState); cdecl;
    PyEval_ReleaseThread            : procedure( tstate: PPyThreadState); cdecl;
    PyInterpreterState_New          : function : PPyInterpreterState; cdecl;
    PyInterpreterState_Clear        : procedure( interp: PPyInterpreterState); cdecl;
    PyInterpreterState_Delete       : procedure( interp: PPyInterpreterState); cdecl;
    PyThreadState_New               : function ( interp: PPyInterpreterState): PPyThreadState; cdecl;
    PyThreadState_Clear             : procedure( tstate: PPyThreadState); cdecl;
    PyThreadState_Delete            : procedure( tstate: PPyThreadState); cdecl;
    PyThreadState_Get               : function : PPyThreadState; cdecl;
    PyThreadState_Swap              : function ( tstate: PPyThreadState): PPyThreadState; cdecl;
    PyErr_SetInterrupt              : procedure; cdecl;
    PyGILState_Ensure               : function() : PyGILstate_STATE; cdecl;
    PyGILState_Release              : procedure(gilstate : PyGILState_STATE); cdecl;

Take a look at this Delphi code that uses the Python library, Faster Whisper, via P4D (Python4Delphi), for audio transcription (in this case in Portuguese):

text
program pP4DFasterWhisper;

{$APPTYPE CONSOLE}
{$R *.res}
uses
  System.SysUtils,
  System.Types,
  System.Diagnostics,
  System.IOUtils,   // TPath, TDirectory
  Windows,
  PythonEngine,
  VarPyth,
  System.Classes,
  System.Net.HttpClient, // For downloading (not used in this version, but kept for template)
  System.Net.HttpClientComponent,
  System.Zip;
var
  PythonEngine: TPythonEngine;
  PythonModule: TPythonModule; // Structured Python module for Delphi functions
  PythonHome: string;
  PyFuncTranscribe: PPyObject;  // Global reference to the transcription function
// -----------------------------------------------------------------------------
// Embedded Python Code (Optimized) - Faster Whisper
// -----------------------------------------------------------------------------
const
  // Initialization script: import dependencies, define globals and model init for Faster Whisper
  EMBEDDED_PYTHON_SCRIPT_INIT_WHISPER: string =
    'import faster_whisper' + sLineBreak +
    'import time' + sLineBreak +
    'import os' + sLineBreak +
    'Models = {}' + sLineBreak +
    'def init_faster_whisper_model(model_path, device, compute_type):' + sLineBreak +
    '    try:' + sLineBreak +
    '        os.environ["CT2_DEVICE"] = device  # Ensure device is set for ctranslate2' + sLineBreak +
    '        model = faster_whisper.WhisperModel(model_path, device=device, compute_type=compute_type)' + sLineBreak +
    '        Models[model_path] = model' + sLineBreak +
    '        print(f"Faster Whisper model loaded from: {model_path} on device: {device} with compute_type: {compute_type}")' + sLineBreak +
    '    except Exception as e:' + sLineBreak +
    '        print(f"Error initializing Faster Whisper model: {e}")' + sLineBreak;
  // Transcription script: batch process audio file in one go for Faster Whisper
  EMBEDDED_PYTHON_SCRIPT_TRANSCRIBE_OPTIMIZED_WHISPER: string =
    'def perform_transcription_optimized(model_path, audio_file_path, beam_size, vad_filter, without_timestamps, max_new_tokens, language):' + sLineBreak + // Added parameters
    '    model = Models[model_path]' + sLineBreak +
    '    transcription_start_time = time.time()' + sLineBreak +
    '    segments, info = model.transcribe(audio_file_path, beam_size=beam_size, vad_filter=vad_filter, without_timestamps=without_timestamps, max_new_tokens=max_new_tokens, language=language)' + sLineBreak + // Pass parameters to transcribe
    '    transcription_end_time = time.time()' + sLineBreak +
    '    transcription_time = transcription_end_time - transcription_start_time' + sLineBreak +
    '    print(f"Python Transcription Time: {transcription_time:.4f} seconds")' + sLineBreak +
    '    transcription_text = ""' + sLineBreak +
    '    segment_loop_start_time = time.time()' + sLineBreak +
    '    for segment in segments:' + sLineBreak +
    '        transcription_text += segment.text + " "' + sLineBreak +
    '    segment_loop_end_time = time.time()' + sLineBreak +
    '    segment_loop_time = segment_loop_end_time - segment_loop_start_time' + sLineBreak +
    '    print(f"Python Segment Printing Loop Time: {segment_loop_time:.4f} seconds")' + sLineBreak +
    '    return transcription_text.strip()' + sLineBreak;

// -----------------------------------------------------------------------------
// CUDA and Python Engine Setup Functions (Pre-caching and GPU init)
// -----------------------------------------------------------------------------
procedure SetupCUDAEnvironment;
var
  OldPath: string;
begin
  // Set CUDA-related environment variables
  SetEnvironmentVariable('CUDA_PATH', 'C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v12.4');
  OldPath := GetEnvironmentVariable('PATH');
  SetEnvironmentVariable('PATH',
    PChar(OldPath +
      ';C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v12.4\bin' +
      ';C:\Program Files\NVIDIA GPU Computing Toolkit\CUDA\v12.4\libnvvp'));
  // Preload key CUDA and CTranslate2 libraries (and potentially torch/faster-whisper deps)
  LoadLibrary(PChar('C:\Users\user\AppData\Local\Programs\Python\Python39\lib\site-packages\torch\lib\cudnn_graph64_9.dll'));
  LoadLibrary(PChar('C:\Users\user\AppData\Local\Programs\Python\Python39\lib\site-packages\ctranslate2\ctranslate2.dll'));
  LoadLibrary(PChar('C:\Windows\system32\DriverStore\FileRepository\nvdmui.inf_amd64_fdc98cdf10f69918\nvcuda64.dll'));
  // Add any other necessary CUDA/cuDNN related DLLs if needed based on Faster Whisper dependencies
end;
procedure InitializeCUDAContext;
begin
  with PythonEngine do
  begin
    // Minimal CUDA initialization for fast startup
    ExecString(AnsiString('import torch; torch.cuda.init(); print("CUDA Device:", torch.cuda.get_device_name(0))'));
    CheckError;
  end;
end;
// Dummy Delphi method (not used in translation)
function DoNothing(Self, Args: PPyObject): PPyObject; cdecl;
begin
  Result := PythonEngine.ReturnNone;
end;
// -----------------------------------------------------------------------------
// Python Engine Initialization (pre-cache engine core and libraries)
// -----------------------------------------------------------------------------
procedure InitializePythonEngine;
begin
  PythonEngine := TPythonEngine.Create(nil);
  PythonEngine.Name := 'PythonEngine';
  // Specify the Python 3.9 DLL and home directory
  PythonEngine.DllName := 'C:\Users\user\AppData\Local\Programs\Python\Python39\python39.dll';
  PythonHome := 'C:\Users\user\AppData\Local\Programs\Python\Python39';
  PythonEngine.SetPythonHome(PWideChar(PythonHome));
  PythonEngine.LoadDll;
  // Create a Python module for any Delphi exports (if needed)
  PythonModule := TPythonModule.Create(nil);
  PythonModule.Engine := PythonEngine;
  PythonModule.ModuleName := 'delphi_module';
  PythonModule.AddMethod('do_nothing', @DoNothing, 'A dummy method.');
end;
// -----------------------------------------------------------------------------
// Initialize and Pre-load Faster Whisper Model
// -----------------------------------------------------------------------------
procedure InitializeFasterWhiper(const ModelPath, Device, ComputeType: string);
var
  pyArgs, pyInitFunc, pyMainModule: PPyObject;
  pyModelPath, pyDevice, pyComputeType: PPyObject;
begin
  with PythonEngine do
  begin
    // Run the initialization script (pre-cache libraries and globals)
    ExecString(AnsiString(EMBEDDED_PYTHON_SCRIPT_INIT_WHISPER));
    CheckError;
    pyMainModule := GetMainModule;
    if not Assigned(pyMainModule) then
      raise Exception.Create('Cannot retrieve __main__ module.');
    pyInitFunc := PyObject_GetAttrString(pyMainModule, 'init_faster_whisper_model');
    Py_XDECREF(pyMainModule);
    if not Assigned(pyInitFunc) then
      raise Exception.Create('Function init_faster_whisper_model not found.');
    // Prepare arguments for Python function
    pyModelPath := PyUnicode_FromWideChar(PWideChar(ModelPath), Length(ModelPath));
    if not Assigned(pyModelPath) then
      raise Exception.Create('Error creating Python string for model path.');
    pyDevice := PyUnicode_FromWideChar(PWideChar(Device), Length(Device));
    if not Assigned(pyDevice) then
      raise Exception.Create('Error creating Python string for device.');
    pyComputeType := PyUnicode_FromWideChar(PWideChar(ComputeType), Length(ComputeType));
    if not Assigned(pyComputeType) then
      raise Exception.Create('Error creating Python string for compute type.');
    pyArgs := MakePyTuple([pyModelPath, pyDevice, pyComputeType]);
    Py_XDECREF(pyModelPath);
    Py_XDECREF(pyDevice);
    Py_XDECREF(pyComputeType);
    // Call the Python init function; minimal error checking for speed
    PyObject_CallObject(pyInitFunc, pyArgs);
    Py_XDECREF(pyArgs);
    Py_XDECREF(pyInitFunc);
    if PyErr_Occurred <> nil then
    begin
      WriteLn('Error initializing Faster Whisper model.');
      PyErr_Print; // Print detailed Python error to console
      PyErr_Clear;
      raise Exception.Create('Error initializing Faster Whisper model (see Python error output).');
    end;
    // Load the optimized transcription script and retrieve the transcription function
    ExecString(AnsiString(EMBEDDED_PYTHON_SCRIPT_TRANSCRIBE_OPTIMIZED_WHISPER));
    CheckError;
    PyFuncTranscribe := PyObject_GetAttrString(GetMainModule, 'perform_transcription_optimized');
    if not Assigned(PyFuncTranscribe) then
      raise Exception.Create('Transcription function not found.');
    CheckError;
  end;
end;

// -----------------------------------------------------------------------------
// Fast Path: Call Optimized Transcription Function (minimal overhead)
// -----------------------------------------------------------------------------
function CallOptimizedTranscript(const ModelPath, AudioFilePath: string): string;
var
  pyArgsTuple, pyResult: PPyObject;
  Transcript: string;
begin
  Transcript := ''; // Initialize in case of error
  // Minimal error-checking version for hot-path performance.
  with PythonEngine do
  begin
    // Build tuple: (model_path, audio_file_path, beam_size, vad_filter, without_timestamps)
    pyArgsTuple := MakePyTuple([
      PyUnicode_FromWideChar(PWideChar(ModelPath), Length(ModelPath)),
      PyUnicode_FromWideChar(PWideChar(AudioFilePath), Length(AudioFilePath)),
      PyLong_FromLong(1),             // beam_size = 1
      PyBool_FromLong(Ord(False)),      // vad_filter = False
      PyBool_FromLong(Ord(True)),       // without_timestamps = True
      Py_None,          // max_new_tokens = PyLong_FromLong(128) (example limit)
      PyUnicode_FromWideChar(PWideChar('pt'), Length('pt')) // language parameter
    ]);

    // Call the optimized transcription function
    pyResult := PyObject_CallObject(PyFuncTranscribe, pyArgsTuple);
    Py_XDECREF(pyArgsTuple);
    // If an error occurred, simply return an error string.
    if (pyResult = nil) or (PyErr_Occurred <> nil) then
    begin
      Transcript := 'Transcription Error';
      PyErr_Print; // Print Python error to console for debugging
      PyErr_Clear;
      Exit;
    end;
    // Expect a Python string back with the transcription.
    Transcript := UTF8ToString(PythonEngine.PyUnicode_AsUTF8(pyResult));
    Py_XDECREF(pyResult);
  end;
  Result := Transcript;
end;

// -----------------------------------------------------------------------------
// Destroy Python Engine and Clean-up
// -----------------------------------------------------------------------------
procedure DestroyEngine;
begin
  if Assigned(PyFuncTranscribe) then
    PythonEngine.Py_XDECREF(PyFuncTranscribe);
  if Assigned(PythonModule) then
    PythonModule.Free;
  if Assigned(PythonEngine) then
    PythonEngine.Free;
end;

// -----------------------------------------------------------------------------
// Main Program: Pre-cache engine/core and perform transcription
// -----------------------------------------------------------------------------
var
  TotalStopwatch: TStopwatch;
  CreateEngineTime, TranscriptionTime, DestroyEngineTime, InitFasterWhisperTime, CUDAInitTime: Int64;
  AudioFilePath, TranscribedText: string;
  ModelPath: string;
  EngineTimer, TranscriptionTimer, InputTimer, WhisperInitTimer, CUDAInitTimer, DestroyEngineTimer: TStopwatch;
  Device, ComputeType: string;
begin
  try
    MaskFPUExceptions(True);
    TotalStopwatch := TStopwatch.StartNew;
    SetupCUDAEnvironment;  // Preload CUDA/related DLLs
    WriteLn('=== Faster Whisper Audio Transcription ===');
    InputTimer := TStopwatch.StartNew;
    Write('Enter path to audio file (e.g., audio.mp3): ');
    ReadLn(AudioFilePath);
    Write('Enter path to Faster Whisper model directory (e.g., Models): ');
    ReadLn(ModelPath);
    Device := 'cpu'; // Fixed to CUDA for optimized version
    ComputeType := 'int8'; // Fixed to int8 for optimized version
    InputTimer.Stop;
    WriteLn('User Input Time: ', InputTimer.ElapsedMilliseconds, ' ms');
    // Pre-initialize Python engine and load required models
    EngineTimer := TStopwatch.StartNew; // Start Engine Timer
    InitializePythonEngine;
    EngineTimer.Stop; // Stop Engine Timer
    CreateEngineTime := EngineTimer.ElapsedMilliseconds;
    CUDAInitTimer := TStopwatch.StartNew; // Start CUDA Init Timer
    InitializeCUDAContext;
    CUDAInitTimer.Stop; // Stop CUDA Init Timer
    CUDAInitTime := CUDAInitTimer.ElapsedMilliseconds;
    WhisperInitTimer := TStopwatch.StartNew;
    InitializeFasterWhiper(ModelPath, Device, ComputeType);
    WhisperInitTimer.Stop; // Stop Whisper Init Timer
    InitFasterWhisperTime := WhisperInitTimer.ElapsedMilliseconds;

    WriteLn(Format('Transcribing audio file: %s using model from %s', [AudioFilePath, ModelPath]));
    TranscriptionTimer := TStopwatch.StartNew;
    TranscribedText := CallOptimizedTranscript(ModelPath, AudioFilePath);
    TranscriptionTimer.Stop;
    TranscriptionTime := TranscriptionTimer.ElapsedMilliseconds;
    WriteLn('');
    WriteLn('=== Transcription Result ===');
    WriteLn('Model Path:       ' + ModelPath);
    WriteLn('Audio File:       ' + AudioFilePath);
    WriteLn('Transcribed Text: ');
    WriteLn(TranscribedText);
    WriteLn('');
    WriteLn('--- Performance Metrics (ms) ---');
    WriteLn('Engine creation:       ', CreateEngineTime, ' ms');
    WriteLn('CUDA Init:             ', CUDAInitTime, ' ms');
    WriteLn('InitFasterWhisper:      ', InitFasterWhisperTime, ' ms');
    WriteLn('Transcription call:    ', TranscriptionTime, ' ms');

  except
    on E: Exception do
      WriteLn(E.ClassName, ': ', E.Message);
  end;
  DestroyEngineTimer := TStopwatch.StartNew; // Start Engine Timer
  DestroyEngine;
  DestroyEngineTimer.Stop; // Stop Engine Timer
  DestroyEngineTime := DestroyEngineTimer.ElapsedMilliseconds;
  WriteLn('Engine Destruct:     ', DestroyEngineTime, ' ms');
  TotalStopwatch.Stop;
  WriteLn('Total Program Execution Time: ', TotalStopwatch.ElapsedMilliseconds, ' ms');
  Write('Press Enter to exit...');
  ReadLn;
end.
initialization
  // Pre-cache Python engine to avoid multiple loads
  InitializePythonEngine;
finalization
  DestroyEngine;
end.

Would it be possible to return to the Delphi side segments and handle them from the Delphi side? Then it would be enough to remove the section:

text
    '    for segment in segments:' + sLineBreak +
    '        transcription_text += segment.text + " "' + sLineBreak +

I believe that, in EMBEDDED_PYTHON_SCRIPT_TRANSCRIBE_OPTIMIZED_WHISPER, it would be much more optimized (due to Delphi being a compiled language, but fast). What do you think? What do you think about leaving the minimum process on the Python side and the fine process of joining the text on the Delphi side? How can segments be transferred to the Delphi side in the most optimized way possible?

Generate the complete and functional code, ensure perfect functionality, and compatibility with Delphi/P4D.

Do everything so that segments is processed on the Delphi side to form the complete transcription text. It is not necessary for now to work with info, you can ignore it for now, we will just capture and pass segments to the Delphi side and process it to form/join the complete text in the most optimized way possible.

Before writing the perfect code solving the requested here, studying this project, say why you guarantee that it will work correctly, with total perfection to be more optimized/faster in text transcription.

Try to avoid the Variant type on the Delphi side to receive segments, look for the most optimized data type possible.

Everything else should work perfectly as before, I just need an adaptation to process segments outside of Python, that is, inside the Delphi/P4D side.

---

My goal is to optimize the project code as much as possible. Interaction with Python should be minimal and essential, interacting only with the essential features without Python, such as the "core" functionality of faster-whisper.