fix code style by pre-commit

README.md

@@ -1 +1 @@
-py/README.md
+py/README.md

py/core/main/config.py

@@ -147,7 +147,7 @@ def from_toml(cls, config_path: Optional[str] = None) -> "R2RConfig":
             config_path = R2RConfig.default_config_path
 
         # Load configuration from TOML file
-        with open(config_path, encoding='utf-8') as f:
+        with open(config_path, encoding="utf-8") as f:
             config_data = toml.load(f)
 
         return cls(config_data)
@@ -164,7 +164,7 @@ def to_toml(self):
 
     @classmethod
     def load_default_config(cls) -> dict:
-        with open(R2RConfig.default_config_path, encoding='utf-8') as f:
+        with open(R2RConfig.default_config_path, encoding="utf-8") as f:
             return toml.load(f)
 
     @staticmethod