Symfony2 is not compatible with php-5.2 and never was.
Python will be under the same situation when the big push onto python-3 finishes over the next ten years. The vast majority of applications runs on python-2 (for performance and backwards compatibility reasons), however that is changing.
Python will be under the same situation when the big push onto python-3 finishes over the next ten years. The vast majority of applications runs on python-2 (for performance and backwards compatibility reasons), however that is changing.