Create hello_world.py

Very simple Python ACT-R code. This is a "Hello World" program, the purpose of which is to aid someone going through the tutorial in making sure that Python ACT-R is running correctly.

Author: githubjimmyd

python_actr/tutorial_code/hello_world.py

@@ -0,0 +1,14 @@
+from python_actr import *              ## Imports the code you need to run Python ACT-R
+
+class MyAgent(ACTR):                   ## Each agent will be an instance of the class MyAgent,
+                                       ##    which is a subclass of the class ACTR
+    
+    focus=Buffer()                     ## There is a memory buffer called focus
+    focus.set('greeting:hello')        ## We set the focus to the task of greeting.
+
+    def hello(focus='greeting:hello'): ## if focus buffer has this thing in it
+        print("hello world!")          ## print something
+        focus.set('greeting:stop')     ## change chunk in focus buffer. Required for it to stop.
+
+tim=MyAgent()                          ## Create an instance of MyAgent called tim
+tim.run()                              ## Now tim has a focus and something to do, so run tim.