modified print statements in agents.py to make it work in Py3, changed utils_test.py with regard to new utils.py

Author: SnShine

agents.py

@@ -54,7 +54,7 @@ def is_alive(self):
 
     def show_state(self):
         "Display the agent's internal state.  Subclasses should override."
-        print "I don't know how to show_state."
+        print("I don't know how to show_state.")
 
     def display(self, canvas, x, y, width, height):
         # Do we need this?
@@ -94,7 +94,7 @@ def TraceAgent(agent):
     old_program = agent.program
     def new_program(percept):
         action = old_program(percept)
-        print '%s perceives %s and does %s' % (agent, percept, action)
+        print('%s perceives %s and does %s' % (agent, percept, action))
         return action
     agent.program = new_program
     return agent
@@ -172,7 +172,7 @@ def TableDrivenVacuumAgent():
 
 def ReflexVacuumAgent():
     "A reflex agent for the two-state vacuum environment. [Fig. 2.8]"
-    def program((location, status)):
+    def program(location, status):
         if status == 'Dirty': return 'Suck'
         elif location == loc_A: return 'Right'
         elif location == loc_B: return 'Left'
@@ -181,7 +181,7 @@ def program((location, status)):
 def ModelBasedVacuumAgent():
     "An agent that keeps track of what locations are clean or dirty."
     model = {loc_A: None, loc_B: None}
-    def program((location, status)):
+    def program(location, status):
         "Same as ReflexVacuumAgent, except if everything is clean, do NoOp."
         model[location] = status ## Update the model here
         if model[loc_A] == model[loc_B] == 'Clean': return 'NoOp'
@@ -276,12 +276,12 @@ def delete_thing(self, thing):
         """Remove a thing from the environment."""
         try:
             self.things.remove(thing)
-        except ValueError, e:
-            print e
-            print "  in Environment delete_thing"
-            print "  Thing to be removed: %s at %s" % (thing, thing.location)
-            print "  from list: %s" % [(thing, thing.location)
-                                       for thing in self.things]
+        except(ValueError, e):
+            print(e)
+            print("  in Environment delete_thing")
+            print("  Thing to be removed: %s at %s" % (thing, thing.location))
+            print("  from list: %s" % [(thing, thing.location)
+                                       for thing in self.things])
         if thing in self.agents:
             self.agents.remove(thing)
 
@@ -410,9 +410,8 @@ def thing_classes(self):
     def percept(self, agent):
         """The percept is a tuple of ('Dirty' or 'Clean', 'Bump' or 'None').
         Unlike the TrivialVacuumEnvironment, location is NOT perceived."""
-        status = if_(self.some_things_at(agent.location, Dirt),
-                     'Dirty', 'Clean')
-        bump = if_(agent.bump, 'Bump', 'None')
+        status = ('Dirty' if self.some_things_at(agent.location, Dirt) else 'Clean')
+        bump = ('Bump' if agent.bump else'None')
         return (status, bump)
 
     def execute_action(self, agent, action):
@@ -592,12 +591,12 @@ def __init__(self, parent, env, canvas):
         scale.pack(side='left')
 
     def run(self):
-        print 'run'
+        print('run')
         self.running = True
         self.background_run()
 
     def stop(self):
-        print 'stop'
+        print('stop')
         self.running = False
 
     def background_run(self):
@@ -610,14 +609,14 @@ def background_run(self):
             self.after(ms, self.background_run)
 
     def list_things(self):
-        print "Things in the environment:"
+        print("Things in the environment:")
         for thing in self.env.things:
-            print "%s at %s" % (thing, thing.location)
+            print("%s at %s" % (thing, thing.location))
 
     def list_agents(self):
-        print "Agents in the environment:"
+        print("Agents in the environment:")
         for agt in self.env.agents:
-            print "%s at %s" % (agt, agt.location)
+            print("%s at %s" % (agt, agt.location))
 
     def set_speed(self, speed):
         self.speed = float(speed)

utils_test.py

@@ -1,5 +1,4 @@
 import pytest
-import utils
 from utils import *
 
 def test_struct_initialization():
@@ -104,8 +103,6 @@ def f():
         return caller()
     assert f() == 'f'
 
-def test_if_():
-    assert if_(2 + 2 == 4, 'ok', lambda: expensive_computation()) == 'ok'
 
 if __name__ == '__main__':
     pytest.main()