Many common Python applications will run on PyPy exactly as they are. Generally, the more the application relies on “vanilla” Python, the more likely it will run on PyPy without modification.

But writing everything in vanilla Python is excellent for learning the ins and outs of deep learning. [Read: How Polestar is using blockchain to increase transparency] In Grokking Deep Learning ...

That said, Cython provides several advantages for the sake of speed not available in vanilla Python, among them variable typing à la C itself. A number of scientific packages for Python ...