diff --git a/src/tirith/core/policy_parameterization.py b/src/tirith/core/policy_parameterization.py
index 022251e..df0e52b 100644
--- a/src/tirith/core/policy_parameterization.py
+++ b/src/tirith/core/policy_parameterization.py
@@ -1,9 +1,11 @@
 import re
 import pydash
 
+
 class PydashPathNotFound:
     pass
 
+
 def check_match(string: str, pattern: re.Pattern) -> re.Match:
     match_ = re.fullmatch(pattern, string)
     return match_
@@ -14,7 +16,7 @@ def helper(dictionary: dict, var_pattern: re.Pattern, var_dict: dict):
         if isinstance(value, str):
             match = check_match(value, var_pattern)
             if bool(match):
-                dictionary[key] = pydash.get(var_dict, match.group(1),default=PydashPathNotFound)
+                dictionary[key] = pydash.get(var_dict, match.group(1), default=PydashPathNotFound)
 
 
 def replace_vars(policy_dict: dict, var_dict: dict) -> dict:
@@ -25,13 +27,13 @@ def replace_vars(policy_dict: dict, var_dict: dict) -> dict:
     for i in range(len(evaluators)):
         match = check_match(evaluators[i]["id"], var_pattern)
         if bool(match):
-            evaluators[i]["id"] = pydash.get(var_dict, match.group(1),default=PydashPathNotFound)
+            evaluators[i]["id"] = pydash.get(var_dict, match.group(1), default=PydashPathNotFound)
 
         helper(evaluators[i]["condition"], var_pattern, var_dict)
         helper(evaluators[i]["provider_args"], var_pattern, var_dict)
 
     match = check_match(policy_dict["eval_expression"], var_pattern)
     if bool(match):
-        policy_dict["eval_expression"] = pydash.get(var_dict, match.group(1),default=PydashPathNotFound)
+        policy_dict["eval_expression"] = pydash.get(var_dict, match.group(1), default=PydashPathNotFound)
 
-    return policy_dict
\ No newline at end of file
+    return policy_dict
diff --git a/tests/core/test_policy_parameterization.py b/tests/core/test_policy_parameterization.py
index 2ba1af7..02ad907 100644
--- a/tests/core/test_policy_parameterization.py
+++ b/tests/core/test_policy_parameterization.py
@@ -2,6 +2,7 @@
 
 from tirith.core.policy_parameterization import replace_vars, PydashPathNotFound
 
+
 @pytest.fixture
 def processed_policy():
     var_dict = {