diff --git a/API/__init__.py b/API/__init__.py
index bea2ed8..9c71e90 100644
--- a/API/__init__.py
+++ b/API/__init__.py
@@ -26,4 +26,4 @@
     "4": CouncilType.LOCAL_LEADER,
     "5": CouncilType.METROPOLITAN_COUNCIL,
     "6": CouncilType.LOCAL_COUNCIL,
-}
\ No newline at end of file
+}
diff --git a/API/candidate.py b/API/candidate.py
index 0cc8ff1..8a0a019 100644
--- a/API/candidate.py
+++ b/API/candidate.py
@@ -11,7 +11,9 @@
 BASE_URL = "http://apis.data.go.kr/9760000/PofelcddInfoInqireService/getPofelcddRegistSttusInfoInqire"
 
 
-def fetch_data(sgId: str, sgTypecode: str, page_no: int = 1, num_of_rows: int = 10_000) -> List[dict]:
+def fetch_data(
+    sgId: str, sgTypecode: str, page_no: int = 1, num_of_rows: int = 10_000
+) -> List[dict]:
     params = {
         "serviceKey": OpenDataPortalSecrets.service_key,
         "pageNo": str(page_no),
@@ -37,6 +39,7 @@ def fetch_data(sgId: str, sgTypecode: str, page_no: int = 1, num_of_rows: int =
 
     return data_list
 
+
 def fetch_all_data(sgIds: List[str], sgTypecodes: List[str]) -> List[dict]:
     data_list = []
     for sgId in sgIds:
@@ -45,6 +48,7 @@ def fetch_all_data(sgIds: List[str], sgTypecodes: List[str]) -> List[dict]:
 
     return data_list
 
+
 if __name__ == "__main__":
     sgTypecode_input = input("원하는 sgTypecode 하나를 입력하세요:\n")
     sgIds_input = input("원하는 sgId를 입력하세요. 여러 개라면 ','로 구분하여 입력하세요:\n").split(",")
diff --git a/API/elected.py b/API/elected.py
index 6542986..cc1d918 100644
--- a/API/elected.py
+++ b/API/elected.py
@@ -11,7 +11,9 @@
 BASE_URL = "http://apis.data.go.kr/9760000/WinnerInfoInqireService2/getWinnerInfoInqire"
 
 
-def fetch_data(sgId: str, sgTypecode: str, page_no: int = 1, num_of_rows: int = 10_000) -> List[dict]:
+def fetch_data(
+    sgId: str, sgTypecode: str, page_no: int = 1, num_of_rows: int = 10_000
+) -> List[dict]:
     params = {
         "serviceKey": OpenDataPortalSecrets.service_key,
         "pageNo": str(page_no),
diff --git a/API/utils.py b/API/utils.py
index 8e170bf..df3b3bf 100644
--- a/API/utils.py
+++ b/API/utils.py
@@ -26,4 +26,4 @@ def save_to_mongo(data: List[dict], sgTypecode: str) -> None:
     # TODO: 지역구별로 분리하여 업데이트하는 로직 추가
     collection.insert_many(data)
 
-    print(f"데이터를 MongoDB의 '{collection_name}' 컬렉션에 저장하였습니다.")
\ No newline at end of file
+    print(f"데이터를 MongoDB의 '{collection_name}' 컬렉션에 저장하였습니다.")
diff --git a/API/votecode.py b/API/votecode.py
index 88d07f7..374e761 100644
--- a/API/votecode.py
+++ b/API/votecode.py
@@ -14,9 +14,7 @@
 if args.code:
     formatted_code = ", ".join([f"({k}) {v}" for k, v in SG_TYPECODE.items()])
     print(formatted_code)
-print(
-        "sgTypecode를 입력하면 해당 sgTypecode와 일치하는 sgId 값을 출력합니다. 여러 개를 입력하려면 ','로 구분해 주세요."
-    )
+print("sgTypecode를 입력하면 해당 sgTypecode와 일치하는 sgId 값을 출력합니다. 여러 개를 입력하려면 ','로 구분해 주세요.")
 
 url = "http://apis.data.go.kr/9760000/CommonCodeService/getCommonSgCodeList"
 params = {