Porting Py3.8/Py3.9:

Since Py3.3: 'Py_ssize_t PyUnicode_GetSize(PyObject*)' is deprecated [-Wdeprecated-declarations]
Since Py3.9: 'PyObject* PyEval_CallObjectWithKeywords(PyObject*, PyObject*, PyObject*)' is deprecated [-Wdeprecated-declarations]
Since Py3.9: 'void PyEval_InitThreads()' is deprecated [-Wdeprecated-declarations]

src/Gui/OnlineDocumentation.cpp

@@ -419,7 +419,11 @@ void StdCmdPythonHelp::activated(int iMsg)
                 char szBuf[201];
                 snprintf(szBuf, 200, "http://localhost:%d", port);
                 PyObject* args = Py_BuildValue("(s)", szBuf);
+#if PY_VERSION_HEX < 0x03090000
                 PyObject* result = PyEval_CallObject(func,args);
+#else
+                PyObject* result = PyObject_CallObject(func,args);
+#endif
                 if (result)
                     failed = false;
         
@@ -455,7 +459,11 @@ bool Gui::OpenURLInBrowser(const char * URL)
         PyObject* func = PyDict_GetItemString(dict, "open");
         if (func) {
             PyObject* args = Py_BuildValue("(s)", URL);
+#if PY_VERSION_HEX < 0x03090000
             PyObject* result = PyEval_CallObject(func,args);
+#else
+            PyObject* result = PyObject_CallObject(func,args);
+#endif
             if (result)
                 failed = false;
         

src/Gui/PythonConsole.cpp

@@ -141,7 +141,11 @@ InteractiveInterpreter::InteractiveInterpreter()
     PyObject* func = PyObject_GetAttrString(module, "InteractiveInterpreter");
     PyObject* args = Py_BuildValue("()");
     d = new InteractiveInterpreterP;
+#if PY_VERSION_HEX < 0x03090000
     d->interpreter = PyEval_CallObject(func,args);
+#else
+    d->interpreter = PyObject_CallObject(func,args);
+#endif
     Py_DECREF(args);
     Py_DECREF(func);
     Py_DECREF(module);
@@ -195,7 +199,11 @@ PyObject* InteractiveInterpreter::compile(const char* source) const
     Base::PyGILStateLocker lock;
     PyObject* func = PyObject_GetAttrString(d->interpreter, "compile");
     PyObject* args = Py_BuildValue("(s)", source);
+#if PY_VERSION_HEX < 0x03090000
     PyObject* eval = PyEval_CallObject(func,args);  // must decref later
+#else
+    PyObject* eval = PyObject_CallObject(func,args);  // must decref later
+#endif
 
     Py_DECREF(args);
     Py_DECREF(func);
@@ -227,7 +235,11 @@ int InteractiveInterpreter::compileCommand(const char* source) const
     Base::PyGILStateLocker lock;
     PyObject* func = PyObject_GetAttrString(d->interpreter, "compile");
     PyObject* args = Py_BuildValue("(s)", source);
+#if PY_VERSION_HEX < 0x03090000
     PyObject* eval = PyEval_CallObject(func,args);  // must decref later
+#else
+    PyObject* eval = PyObject_CallObject(func,args);  // must decref later
+#endif
 
     Py_DECREF(args);
     Py_DECREF(func);

src/Gui/WidgetFactory.cpp

@@ -1677,7 +1677,11 @@ void SignalConnect::onExecute()
 
     /* Time to call the callback */
     arglist = Py_BuildValue("(O)", myResource);
+#if PY_VERSION_HEX < 0x03090000
     result = PyEval_CallObject(myCallback, arglist);
+#else
+    result = PyObject_CallObject(myCallback, arglist);
+#endif
     Py_XDECREF(result);
     Py_DECREF(arglist);
 }

src/Gui/Widgets.cpp

@@ -850,7 +850,11 @@ void UrlLabel::mouseReleaseEvent (QMouseEvent *)
         PyObject* func = PyDict_GetItemString(dict, "open");
         if (func) {
             PyObject* args = Py_BuildValue("(s)", (const char*)this->_url.toLatin1());
+#if PY_VERSION_HEX < 0x03090000
             PyObject* result = PyEval_CallObject(func,args);
+#else
+            PyObject* result = PyObject_CallObject(func,args);
+#endif
             // decrement the args and module reference
             Py_XDECREF(result);
             Py_DECREF(args);