It's not just the lowest impedance mismatch, but it's also a framework coming out of google, where python and Java were really the only two language choices for

It's not just the lowest impedance mismatch, but it's also a framework coming out of google, where python and Java were really the only two language choices for a high level interface, and of the two python is the clear winner in prototyping / scientific community acceptance. I think it's because of the ease in experimentation and expressiveness of the language.