diff --git a/banking/account_management.py b/banking/account_management.py
index 1fe44c0e3..4a41344cd 100644
--- a/banking/account_management.py
+++ b/banking/account_management.py
@@ -3,6 +3,7 @@
 import logging
 from typing import Dict
 
+
 def create_account(account_type: str, balance: float, customer_id: int) -> Dict:
     """
     Create a new account for a customer.
@@ -18,22 +19,23 @@ def create_account(account_type: str, balance: float, customer_id: int) -> Dict:
     # implementation
     logging.info(f"Creating account for customer {customer_id}")
     # Validate input parameters
-    if account_type not in ['checking', 'savings']:
+    if account_type not in ["checking", "savings"]:
         raise ValueError("Invalid account type")
     if balance < 0:
         raise ValueError("Balance cannot be negative")
 
     # Create account and store it in a database or in-memory data structure
     account = {
-        'id': generate_unique_id(),
-        'type': account_type,
-        'balance': balance,
-        'customer_id': customer_id
+        "id": generate_unique_id(),
+        "type": account_type,
+        "balance": balance,
+        "customer_id": customer_id,
     }
 
     # Return the account information
     return account
 
+
 def update_account(account_id: int, account_type: str, balance: float) -> bool:
     """
     Update an existing account.
@@ -49,7 +51,7 @@ def update_account(account_id: int, account_type: str, balance: float) -> bool:
     # implementation
     logging.info(f"Updating account {account_id}")
     # Validate input parameters
-    if account_type not in ['checking', 'savings']:
+    if account_type not in ["checking", "savings"]:
         raise ValueError("Invalid account type")
     if balance < 0:
         raise ValueError("Balance cannot be negative")
@@ -58,8 +60,8 @@ def update_account(account_id: int, account_type: str, balance: float) -> bool:
     account = get_account_by_id(account_id)
 
     # Update the account information
-    account['type'] = account_type
-    account['balance'] = balance
+    account["type"] = account_type
+    account["balance"] = balance
 
     # Save the updated account back to the database or in-memory data structure
     save_account(account)
@@ -67,6 +69,7 @@ def update_account(account_id: int, account_type: str, balance: float) -> bool:
     # Return True to indicate success
     return True
 
+
 def delete_account(account_id: int) -> bool:
     """
     Delete an account.