Numexpr package evaluates multiple-operator array expressions

 many times faster than NumPy can. It accepts the expression as a string,
 analyzes it, rewrites it more efficiently, and compiles it to faster Python
 code on the fly. It's the next best thing to writing the expression in C and
 compiling it with a specialized just-in-time (JIT) compiler, i.e. it does not
 require a compiler at runtime.