If by this you mean "give me exactly Python 3's text model without breaking my unmodified Python 2 code", you should be aware that A) this is impossible because B) the Python 3 text model is backwards-incompatible with unmodified Python 2 code, and C) that's kinda why Python 3 existed and was backwards-incompatible.
If by this you mean "give me exactly Python 3's text model without breaking my unmodified Python 2 code", you should be aware that A) this is impossible because B) the Python 3 text model is backwards-incompatible with unmodified Python 2 code, and C) that's kinda why Python 3 existed and was backwards-incompatible.