diff --git a/blockchain/wallet.py b/blockchain/wallet.py
index 0435c425d..b23d52db9 100644
--- a/blockchain/wallet.py
+++ b/blockchain/wallet.py
@@ -1,13 +1,14 @@
 import hashlib
 import time
 
+
 class Wallet:
     def __init__(self):
-        self.private_key = hashlib.sha256(str(time.time()).encode('utf-8')).hexdigest()
-        self.public_key = hashlib.sha256(self.private_key.encode('utf-8')).hexdigest()
+        self.private_key = hashlib.sha256(str(time.time()).encode("utf-8")).hexdigest()
+        self.public_key = hashlib.sha256(self.private_key.encode("utf-8")).hexdigest()
 
     def generate_address(self):
-        return hashlib.sha256(self.public_key.encode('utf-8')).hexdigest()
+        return hashlib.sha256(self.public_key.encode("utf-8")).hexdigest()
 
     def send_transaction(self, recipient, amount):
         transaction = Transaction(self.generate_address(), recipient, amount)