fix some issue with gym_compat module

Author: BDonnot

.gitignore

@@ -416,6 +416,7 @@ getting_started/venv_310_ray/
 grid2op/tests/venv_test_autoclass/
 test_eduardo.py
 grid2op/tests/failed_test*
+venv_312
 
 # profiling files
 **.prof

CHANGELOG.rst

@@ -75,6 +75,8 @@ Next release
   (wrong sign for the slack generator)
 - [FIXED] the environment would not load in case of an incorrect "layout.json"
   instead of raising a warning.
+- [FIXED] some issue with gym_compat module for "newest" version of 
+  gymnasium (1.0.0)
 - [IMPROVED] error message when forecasts are not correctly set-up
 
 [1.10.3] - 2024-07-12

grid2op/gym_compat/gym_space_converter.py

@@ -266,7 +266,11 @@ def seed(self, seed=None):
         of openAI gym
         """
         seeds = super(type(self)._DictType, self).seed(seed)
-        sub_seeds = seeds
+        if isinstance(seeds, (int, dt_int)):
+            # newer gymansium version returns int and not a list
+            sub_seeds = [seeds]
+        else:
+            sub_seeds = seeds
         max_ = np.iinfo(dt_int).max
         for i, space_key in enumerate(sorted(self.spaces.keys())):
             sub_seed = sample_seed(max_, self.np_random)