Method and function

The examples I looked at all had whereas you have
In the former case you can just use execute(....) but in the latter case it needs to be interpreter.execute

Basically "import" imports the namespace and the commands that it contains, whereas "from X import *" imports all the commands into the current namespace.

from filename import * is retrievable from call.ngc as pictured foregoing.  Such a way importloop.py is a library.

g71_8.py the from interpreter import * causes an error upon opening Axis and Lathe.  Presently import interpreter isn't causing an error.  Then supposedly the interpreter class is only retrievable.  The interpreter class is the entire file. 

LinuxCNC_Documentation.pdf and page 329 includes argspec parameter. It appears some uppercase parameters with argspec error too.

g71_8.py the from interpreter import * no error now upon opening Axis and Lathe. interpretor was misspelled that caused error.

Interpreter and NML references
canon.hh
emc_interface.py
emc_nml.hh