py3: App: files D-Z ported to python3

issue 0000995
diff to py3-branch will remain in the following files in src/App:
- ExtensionContainer.cpp
- FeaturePythonPyImp.h +.inl
most likely these files depend on Tools and Base

src/App/PropertyFile.cpp

@@ -253,8 +253,55 @@ PyObject *PropertyFileIncluded::getPyObject(void)
     return p;
 }
 
+#if PY_MAJOR_VERSION >= 3
+namespace App {
+const char* getNameFromFile(PyObject* value)
+{
+    const char* string = 0;
+    PyObject *oname = PyObject_GetAttrString (value, "name");
+    if (oname) {
+        if (PyUnicode_Check (oname)) {
+            string = PyUnicode_AsUTF8 (oname);
+        }
+        else if (PyBytes_Check (oname)) {
+            string = PyBytes_AsString (oname);
+        }
+        Py_DECREF (oname);
+    }
+
+    if (!string)
+        throw Base::TypeError("Unable to get filename");
+    return string;
+}
+
+
+
+bool isIOFile(PyObject* file)
+{
+    PyObject* io = PyImport_ImportModule("io");
+    PyObject* IOBase_Class = PyObject_GetAttrString(io, "IOBase");
+    bool isFile = PyObject_IsInstance(file, IOBase_Class);
+    Py_DECREF(IOBase_Class);
+    Py_DECREF(io);
+    return isFile;
+}
+}
+#endif
+
 void PropertyFileIncluded::setPyObject(PyObject *value)
 {
+#if PY_MAJOR_VERSION >= 3
+    std::string string;
+    if (PyUnicode_Check(value)) {
+        string = PyUnicode_AsUTF8(value);
+    }
+    else if (PyBytes_Check(value)) {
+        string = PyBytes_AsString(value);
+    }
+    else if (isIOFile(value)){
+        string = getNameFromFile(value);
+    }
+#else
     std::string string;
     if (PyUnicode_Check(value)) {
         PyObject* unicode = PyUnicode_AsUTF8String(value);
@@ -268,6 +315,7 @@ void PropertyFileIncluded::setPyObject(PyObject *value)
         PyObject* FileName = PyFile_Name(value);
         string = PyString_AsString(FileName);
     }
+#endif
     else if (PyTuple_Check(value)) {
         if (PyTuple_Size(value) != 2)
             throw Base::TypeError("Tuple needs size of (filePath,newFileName)"); 
@@ -276,6 +324,17 @@ void PropertyFileIncluded::setPyObject(PyObject *value)
 
         // decoding file
         std::string fileStr;
+#if PY_MAJOR_VERSION >= 3
+        if (PyUnicode_Check(file)) {
+            fileStr = PyUnicode_AsUTF8(file);
+        }
+        else if (PyBytes_Check(file)) {
+            fileStr = PyBytes_AsString(file);
+        }
+        else if (isIOFile(value)) {
+            fileStr = getNameFromFile(file);
+        }
+#else
         if (PyUnicode_Check(file)) {
             PyObject* unicode = PyUnicode_AsUTF8String(file);
             fileStr = PyString_AsString(unicode);
@@ -288,6 +347,7 @@ void PropertyFileIncluded::setPyObject(PyObject *value)
             PyObject* FileName = PyFile_Name(file);
             fileStr = PyString_AsString(FileName);
         }
+#endif
         else {
             std::string error = std::string("First item in tuple must be a file or string, not ");
             error += file->ob_type->tp_name;
@@ -296,6 +356,17 @@ void PropertyFileIncluded::setPyObject(PyObject *value)
 
         // decoding name
         std::string nameStr;
+#if PY_MAJOR_VERSION >= 3
+        if (PyUnicode_Check(name)) {
+            nameStr = PyUnicode_AsUTF8(name);
+        }
+        else if (PyBytes_Check(name)) {
+            nameStr = PyBytes_AsString(name);
+        }
+        else if (isIOFile(value)) {
+            nameStr = getNameFromFile(name);
+        }
+#else
         if (PyString_Check(name)) {
             nameStr = PyString_AsString(name);
         }
@@ -303,6 +374,7 @@ void PropertyFileIncluded::setPyObject(PyObject *value)
             PyObject* FileName = PyFile_Name(name);
             nameStr = PyString_AsString(FileName);
         }
+#endif
         else {
             std::string error = std::string("Second item in tuple must be a string, not ");
             error += name->ob_type->tp_name;