Key differences include print as a function, integer division behavior, and Unicode support. Transitioning from Python 2 to 3 requires updating syntax and libraries.

The transition from Python 2 to Python 3 introduced several important changes that affect code compatibility and functionality. One of the most noticeable differences is the print statement in Python 2, which becomes a function in Python 3. This means that all print statements must be updated to use parentheses, e.g., print("Hello, world!"). Another key difference is the behavior of integer division; in Python 2, dividing two integers performs floor division, while Python 3 returns a float. To achieve floor division in Python 3, you must use the // operator. Python 3 also features improved Unicode support, allowing for better handling of string data in various languages. As a result, strings in Python 3 are Unicode by default, whereas Python 2 requires a separate unicode type. Transitioning from Python 2 to Python 3 may require updating your code syntax and reviewing any third-party libraries you depend on to ensure compatibility. By understanding these differences, you can effectively migrate and take full advantage of the features in Python 3.