fix(examples): bank_reserves (#267)

* fix(pip): update requirements.txt

* fix(examples): update bank_reserves for mesa>=3

* fix(examples): use correct key for portrayal color

Author: dlovell

examples/bank_reserves/app.py

@@ -0,0 +1,101 @@
+from bank_reserves.agents import Person
+from bank_reserves.model import BankReservesModel
+from mesa.visualization import (
+    SolaraViz,
+    make_plot_component,
+    make_space_component,
+)
+from mesa.visualization.user_param import (
+    Slider,
+)
+
+# The colors here are taken from Matplotlib's tab10 palette
+# Green
+RICH_COLOR = "#2ca02c"
+# Red
+POOR_COLOR = "#d62728"
+# Blue
+MID_COLOR = "#1f77b4"
+
+
+def person_portrayal(agent):
+    if agent is None:
+        return
+
+    portrayal = {}
+
+    # update portrayal characteristics for each Person object
+    if isinstance(agent, Person):
+        portrayal["Shape"] = "circle"
+        portrayal["r"] = 0.5
+        portrayal["Layer"] = 0
+        portrayal["Filled"] = "true"
+
+        color = MID_COLOR
+
+        # set agent color based on savings and loans
+        if agent.savings > agent.model.rich_threshold:
+            color = RICH_COLOR
+        if agent.savings < 10 and agent.loans < 10:
+            color = MID_COLOR
+        if agent.loans > 10:
+            color = POOR_COLOR
+
+        portrayal["color"] = color
+
+    return portrayal
+
+
+def post_process_space(ax):
+    ax.set_aspect("equal")
+    ax.set_xticks([])
+    ax.set_yticks([])
+
+
+def post_process_lines(ax):
+    ax.legend(loc="center left", bbox_to_anchor=(1, 0.9))
+
+
+# dictionary of user settable parameters - these map to the model __init__ parameters
+model_params = {
+    "init_people": Slider(
+        "People",
+        25,
+        1,
+        200,
+        # description="Initial Number of People"
+    ),
+    "rich_threshold": Slider(
+        "Rich Threshold",
+        10,
+        1,
+        20,
+        # description="Upper End of Random Initial Wallet Amount",
+    ),
+    "reserve_percent": Slider(
+        "Reserves",
+        50,
+        1,
+        100,
+        # description="Percent of deposits the bank has to hold in reserve",
+    ),
+}
+
+space_component = make_space_component(
+    person_portrayal,
+    draw_grid=False,
+    post_process=post_process_space,
+)
+lineplot_component = make_plot_component(
+    {"Rich": RICH_COLOR, "Poor": POOR_COLOR, "Middle Class": MID_COLOR},
+    post_process=post_process_lines,
+)
+model = BankReservesModel()
+
+page = SolaraViz(
+    model,
+    components=[space_component, lineplot_component],
+    model_params=model_params,
+    name="Bank Reserves Model",
+)
+page  # noqa

examples/bank_reserves/bank_reserves/server.py

@@ -1,4 +1,4 @@
-itertools
-mesa~=2.0
+mesa[viz]>=3.1.4
+networkx
 numpy
 pandas