model: Ensure the seed is initialized with current timestamp when it …

…is None
projectmesa · Sep 21, 2023 · 0e68333 · 0e68333
1 parent 3dbabfe
commit 0e68333
Showing 1 changed file with 6 additions and 1 deletion.
diff --git a/mesa/model.py b/mesa/model.py
@@ -7,6 +7,7 @@
 # Remove this __future__ import once the oldest supported Python is 3.10
 from __future__ import annotations
 
+import datetime
 import random
 
 # mypy
@@ -21,7 +22,11 @@ class Model:
     def __new__(cls, *args: Any, **kwargs: Any) -> Any:
         """Create a new model object and instantiate its RNG automatically."""
         obj = object.__new__(cls)
-        obj._seed = kwargs.get("seed", None)
+        obj._seed = kwargs.get("seed")
+        if obj._seed is None:
+            # We explicitly specify the seed here so that we know its value in
+            # advance.
+            obj._seed = random.random()
         obj.random = random.Random(obj._seed)
         return obj