error: 'Generator[FastqRecord]' object has no attribute '__to_py__'

[panxiaoguang]

A function that returns a generator can not be written into a python extension

[panxiaoguang]

Hi，Everything is ok when I compile codon codes into a binary program if a function that returns a generator is in codes. However, it raises an error if I try to compile the same codes into a Python extension.

It's good to have a 'to_py' method in the Codon native generator!