Python 2.7 v/s Python 3.7

Question

I have seen that the code that i write in python 2 is copied and pasted in python 3 it doesn't works . I don't understand it why?

Answer 1

Use the search bar, there are many question already like this

Answer 2

Because they're much different for syntax

Answer 3

Just read the documentations for both. I am sure you will have your answers well explained.