[paramsingh]

This might be a silly question as I don't know much about compilers or interpreters, but how is that possible? Also, why hasn't the Python community tried to make PyPy the default then?

[empyrical]

> how is that possible

PyPy is written in a restricted subset of Python called RPython, which gets translated into C

https://rpython.readthedocs.org/en/latest/faq.html

[njbooher]

Various packages are incompatible with PyPy.

http://pypy.org/compat.html

[tyho]

PyPy is written in a subset of python called RPython. It is translated into c then executed.