diff --git a/confit/config.py b/confit/config.py
index 32f7661..eb93022 100644
--- a/confit/config.py
+++ b/confit/config.py
@@ -141,11 +141,12 @@ def from_cfg_str(cls, s: str, resolve: bool = False, registry: Any = None) -> An
     @classmethod
     def from_yaml_str(cls, s: str, resolve: bool = False, registry: Any = None) -> Any:
         import yaml
+
         class ConfitYamlLoader(yaml.SafeLoader):
             def construct_object(self, x, deep=False):
                 if isinstance(x, yaml.ScalarNode):
                     if x.style == '"' or x.style == "'":
-                        return loads(x.style+x.value+x.style)
+                        return loads(x.style + x.value + x.style)
                     return loads(x.value)
                 return super().construct_object(x, deep)
 
diff --git a/confit/utils/xjson.py b/confit/utils/xjson.py
index 61e4739..1941527 100644
--- a/confit/utils/xjson.py
+++ b/confit/utils/xjson.py
@@ -272,7 +272,7 @@ def loads(s: str):
         if set(s) & set(",'\"{}[]$"):
             raise MalformedValueError(s)
         return s
-       
+
 
 def dumps(o: Any):
     """
diff --git a/tests/test_config_instance.py b/tests/test_config_instance.py
index b8b8f0e..ffd4038 100644
--- a/tests/test_config_instance.py
+++ b/tests/test_config_instance.py
@@ -699,8 +699,9 @@ def test_very_long_yaml_config():
 
 
 def test_escaped_string():
-    config = Config.from_yaml_str("""
-test: 
+    config = Config.from_yaml_str(
+        """
+test:
     a: "1"
 section:
     num: 1
@@ -708,9 +709,10 @@ def test_escaped_string():
     real_ref: ${test.a}
     escaped_broken_ref: "${test.a"
     escaped_ref: "${test.a}"
-""").resolve(registry=registry)
+"""
+    ).resolve(registry=registry)
     assert config["section"]["num"] == 1
     assert config["section"]["escaped_num"] == "1"
     assert config["section"]["real_ref"] == "1"
     assert config["section"]["escaped_broken_ref"] == "${test.a"
-    assert config["section"]["escaped_ref"] == "${test.a}"
\ No newline at end of file
+    assert config["section"]["escaped_ref"] == "${test.a}"