NOTE: this syntax is unstable and very likely to change before Hark v1.0, in particular, to permit qualified imports.
Python functions (or callables) are imported into a Hark program with
with the following signature:
import(name, module, num_args);
name: identifier, the name of the function to import
module: identifier, module to import from
num_args: int, number of arguments the function takes
import(foo, my_package.bar, 1);