fix: sugarscape_cg: Ensure agent ids are unique

examples/sugarscape_cg/sugarscape_cg/agents.py

@@ -18,8 +18,10 @@ def get_distance(pos_1, pos_2):
 
 
 class SsAgent(mesa.Agent):
-    def __init__(self, pos, model, moore=False, sugar=0, metabolism=0, vision=0):
-        super().__init__(pos, model)
+    def __init__(
+        self, unique_id, pos, model, moore=False, sugar=0, metabolism=0, vision=0
+    ):
+        super().__init__(unique_id, model)
         self.pos = pos
         self.moore = moore
         self.sugar = sugar
@@ -73,8 +75,8 @@ def step(self):
 
 
 class Sugar(mesa.Agent):
-    def __init__(self, pos, model, max_sugar):
-        super().__init__(pos, model)
+    def __init__(self, unique_id, pos, model, max_sugar):
+        super().__init__(unique_id, model)
         self.amount = max_sugar
         self.max_sugar = max_sugar
 

examples/sugarscape_cg/sugarscape_cg/model.py

@@ -44,9 +44,11 @@ def __init__(self, width=50, height=50, initial_population=100):
         import numpy as np
 
         sugar_distribution = np.genfromtxt("sugarscape_cg/sugar-map.txt")
+        agent_id = 0
         for _, x, y in self.grid.coord_iter():
             max_sugar = sugar_distribution[x, y]
-            sugar = Sugar((x, y), self, max_sugar)
+            sugar = Sugar(agent_id, (x, y), self, max_sugar)
+            agent_id += 1
             self.grid.place_agent(sugar, (x, y))
             self.schedule.add(sugar)
 
@@ -57,7 +59,8 @@ def __init__(self, width=50, height=50, initial_population=100):
             sugar = self.random.randrange(6, 25)
             metabolism = self.random.randrange(2, 4)
             vision = self.random.randrange(1, 6)
-            ssa = SsAgent((x, y), self, False, sugar, metabolism, vision)
+            ssa = SsAgent(agent_id, (x, y), self, False, sugar, metabolism, vision)
+            agent_id += 1
             self.grid.place_agent(ssa, (x, y))
             self.schedule.add(ssa)