Fix mypy error (#2067)

* Fix mypy error

* Ignore new errors

Author: araffin

stable_baselines3/common/save_util.py

@@ -181,7 +181,7 @@ def json_to_data(json_string: str, custom_objects: Optional[dict[str, Any]] = No
 @functools.singledispatch
 def open_path(
     path: Union[str, pathlib.Path, io.BufferedIOBase], mode: str, verbose: int = 0, suffix: Optional[str] = None
-) -> Union[io.BufferedWriter, io.BufferedReader, io.BytesIO]:
+) -> Union[io.BufferedWriter, io.BufferedReader, io.BytesIO, io.BufferedRandom]:
     """
     Opens a path for reading or writing with a preferred suffix and raises debug information.
     If the provided path is a derivative of io.BufferedIOBase it ensures that the file

stable_baselines3/common/vec_env/vec_normalize.py

@@ -241,7 +241,7 @@ def normalize_obs(self, obs: Union[np.ndarray, dict[str, np.ndarray]]) -> Union[
                 assert self.norm_obs_keys is not None
                 # Only normalize the specified keys
                 for key in self.norm_obs_keys:
-                    obs_[key] = self._normalize_obs(obs[key], self.obs_rms[key]).astype(np.float32)
+                    obs_[key] = self._normalize_obs(obs[key], self.obs_rms[key]).astype(np.float32)  # type: ignore[call-overload]
             else:
                 assert isinstance(self.obs_rms, RunningMeanStd)
                 obs_ = self._normalize_obs(obs, self.obs_rms).astype(np.float32)
@@ -265,7 +265,7 @@ def unnormalize_obs(self, obs: Union[np.ndarray, dict[str, np.ndarray]]) -> Unio
             if isinstance(obs, dict) and isinstance(self.obs_rms, dict):
                 assert self.norm_obs_keys is not None
                 for key in self.norm_obs_keys:
-                    obs_[key] = self._unnormalize_obs(obs[key], self.obs_rms[key])
+                    obs_[key] = self._unnormalize_obs(obs[key], self.obs_rms[key])  # type: ignore[call-overload]
             else:
                 assert isinstance(self.obs_rms, RunningMeanStd)
                 obs_ = self._unnormalize_obs(obs, self.obs_rms)

tests/test_vec_envs.py

@@ -17,7 +17,7 @@
 from stable_baselines3.common.vec_env import DummyVecEnv, SubprocVecEnv, VecFrameStack, VecNormalize, VecVideoRecorder
 
 try:
-    import moviepy
+    import moviepy  # noqa: F401
 
     have_moviepy = True
 except ImportError: