I never quite got what made python 2 -> 3 so much more complicated than say php 5 to 7. I heard nobody complain the time I was still active in the PHP world (l

I never quite got what made python 2 -> 3 so much more complicated than say php 5 to 7. I heard nobody complain the time I was still active in the PHP world (lucky me right?). Yet the Python2 code just kept lingering everywhere.