add reserved key in config (#315)

mmcv/utils/config.py

@@ -14,6 +14,7 @@ from .path import check_file_exist
 
 BASE_KEY = '_base_'
 DELETE_KEY = '_delete_'
+RESERVED_KEYS = ['filename', 'text', 'pretty_text']
 
 
 class ConfigDict(Dict):
@@ -184,6 +185,9 @@ class Config(object):
         elif not isinstance(cfg_dict, dict):
             raise TypeError('cfg_dict must be a dict, but '
                             f'got {type(cfg_dict)}')
+        for key in cfg_dict:
+            if key in RESERVED_KEYS:
+                raise KeyError(f'{key} is reserved for config file')
 
         super(Config, self).__setattr__('_cfg_dict', ConfigDict(cfg_dict))
         super(Config, self).__setattr__('_filename', filename)

tests/data/config/g.py

+filename = 'reserved.py'

tests/test_config.py

@@ -266,3 +266,9 @@ def test_dump_mapping():
         text_cfg = Config.fromfile(text_cfg_filename)
 
     assert text_cfg._cfg_dict == cfg._cfg_dict
+
+
+def test_reserved_key():
+    cfg_file = osp.join(osp.dirname(__file__), 'data/config/g.py')
+    with pytest.raises(KeyError):
+        Config.fromfile(cfg_file)