docs/tutorial: Replace scheduler in MoneyModel (#2475)

Replace scheduler in MoneyModel with AgentSet functionality. This model is used in the Viz tutorial.

Author: EwoutH

docs/tutorials/MoneyModel.py

@@ -4,7 +4,7 @@
 
 
 def compute_gini(model):
-    agent_wealths = [agent.wealth for agent in model.schedule.agents]
+    agent_wealths = [agent.wealth for agent in model.agents]
     x = sorted(agent_wealths)
     N = model.num_agents
     B = sum(xi * (N - i) for i, xi in enumerate(x)) / (N * sum(x))
@@ -60,12 +60,10 @@ def __init__(self, n=10, width=10, height=10, seed=None):
         super().__init__(seed=seed)
         self.num_agents = n
         self.grid = mesa.space.MultiGrid(width, height, True)
-        self.schedule = mesa.time.RandomActivation(self)
 
         # Create agents
         for _ in range(self.num_agents):
             a = MoneyAgent(self)
-            self.schedule.add(a)
             # Add the agent to a random grid cell
             x = self.random.randrange(self.grid.width)
             y = self.random.randrange(self.grid.height)
@@ -74,8 +72,9 @@ def __init__(self, n=10, width=10, height=10, seed=None):
         self.datacollector = mesa.DataCollector(
             model_reporters={"Gini": compute_gini}, agent_reporters={"Wealth": "wealth"}
         )
+        self.datacollector.collect(self)
 
     def step(self):
         """do one step of the model"""
+        self.agents.shuffle_do("step")
         self.datacollector.collect(self)
-        self.schedule.step()