In case of Qt and Python vs C++, the code is translatable almost line by line, especially if the C++ original uses Qt constructs like foreach() for looping. There are a few caveats regarding variable scope and garbage collection, but in general it should not be an issue. Python to C++ is a bit more nasty (as C++ simply lacks a lot of the built-in goodies Python has, even with Qt - f.e. list comprehension).