Migrate to modern Python Logger API (#8449)

### Description
This PR resolves the deprecation warnings of the `logger` library:
```python
DeprecationWarning: The 'warn' method is deprecated, use 'warning' instead
```

### Types of changes
<!--- Put an `x` in all the boxes that apply, and remove the not
applicable items -->
- [x] Non-breaking change (fix or new feature that would not break
existing functionality).
- [ ] Breaking change (fix or new feature that would cause existing
functionality to change).
- [ ] New tests added to cover the changes.
- [ ] Integration tests passed locally by running `./runtests.sh -f -u
--net --coverage`.
- [ ] Quick tests passed locally by running `./runtests.sh --quick
--unittests --disttests`.
- [ ] In-line docstrings updated.
- [ ] Documentation updated, tested `make html` command in the `docs/`
folder.

Signed-off-by: Emmanuel Ferdman <[email protected]>
Co-authored-by: Eric Kerfoot <[email protected]>

Author: emmanuel-ferdman

monai/apps/auto3dseg/auto_runner.py

@@ -570,7 +570,7 @@ def set_device_info(
             self.device_setting["CUDA_VISIBLE_DEVICES"] = ",".join([str(x) for x in cuda_visible_devices])
             self.device_setting["n_devices"] = len(cuda_visible_devices)
         else:
-            logger.warn(f"Wrong format of cuda_visible_devices {cuda_visible_devices}, devices not set")
+            logger.warning(f"Wrong format of cuda_visible_devices {cuda_visible_devices}, devices not set")
 
         if num_nodes is None:
             num_nodes = int(os.environ.get("NUM_NODES", 1))

monai/bundle/workflows.py

@@ -226,7 +226,7 @@ def add_property(self, name: str, required: str, desc: str | None = None) -> Non
         if self.properties is None:
             self.properties = {}
         if name in self.properties:
-            logger.warn(f"property '{name}' already exists in the properties list, overriding it.")
+            logger.warning(f"property '{name}' already exists in the properties list, overriding it.")
         self.properties[name] = {BundleProperty.DESC: desc, BundleProperty.REQUIRED: required}
 
     def check_properties(self) -> list[str] | None:
@@ -421,7 +421,7 @@ def __init__(
             for _config_file in _config_files:
                 _config_file = Path(_config_file)
                 if _config_file.parent != config_root_path:
-                    logger.warn(
+                    logger.warning(
                         f"Not all config files are in {config_root_path}. If logging_file and meta_file are"
                         f"not specified, {config_root_path} will be used as the default config root directory."
                     )
@@ -434,11 +434,11 @@ def __init__(
         self.config_root_path = config_root_path
         logging_file = str(self.config_root_path / "logging.conf") if logging_file is None else logging_file
         if logging_file is False:
-            logger.warn(f"Logging file is set to {logging_file}, skipping logging.")
+            logger.warning(f"Logging file is set to {logging_file}, skipping logging.")
         else:
             if not os.path.isfile(logging_file):
                 if logging_file == str(self.config_root_path / "logging.conf"):
-                    logger.warn(f"Default logging file in {logging_file} does not exist, skipping logging.")
+                    logger.warning(f"Default logging file in {logging_file} does not exist, skipping logging.")
                 else:
                     raise FileNotFoundError(f"Cannot find the logging config file: {logging_file}.")
             else:
@@ -503,17 +503,17 @@ def check_properties(self) -> list[str] | None:
         """
         ret = super().check_properties()
         if self.properties is None:
-            logger.warn("No available properties had been set, skipping check.")
+            logger.warning("No available properties had been set, skipping check.")
             return None
         if ret:
-            logger.warn(f"Loaded bundle does not contain the following required properties: {ret}")
+            logger.warning(f"Loaded bundle does not contain the following required properties: {ret}")
         # also check whether the optional properties use correct ID name if existing
         wrong_props = []
         for n, p in self.properties.items():
             if not p.get(BundleProperty.REQUIRED, False) and not self._check_optional_id(name=n, property=p):
                 wrong_props.append(n)
         if wrong_props:
-            logger.warn(f"Loaded bundle defines the following optional properties with wrong ID: {wrong_props}")
+            logger.warning(f"Loaded bundle defines the following optional properties with wrong ID: {wrong_props}")
         if ret is not None:
             ret.extend(wrong_props)
         return ret