Comment by 9rx
That's not really true, but we're talking about a Python replacement for scripting tasks, not core compute tasks, anyway. It is not like Python is the paragon of SIMD support. Any real Python workloads end up being written in C for good reason, using Python only as the glue. Go can also interface with C code, and despite all the flack it gets for its C call overhead it is still significantly faster at calling C code than Python is.
For the record of people reading this, I wrote a multithreaded SIMD-heavy compute task in Go, and it suffered only 5% slowdown vs the original hand-optimized C++ version.
The low level SIMD stuff was called out to over the c FFI bridge; golang was used for the rest of the program.