[pre-commit.ci] auto fixes from pre-commit.com hooks

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Author: pre-commit-ci[bot]

blockchain/README.md

@@ -45,4 +45,4 @@ So this is all about introduction to blockchain technology. To learn more about
 * <https://www.geeksforgeeks.org/modular-division/>
 
 ## about blockchain_main file:
-This python file contains the code for basic implementaion of blockchain in python with proof of work algorithm. 
+This python file contains the code for basic implementaion of blockchain in python with proof of work algorithm.

blockchain/blockchain_main.py

@@ -3,14 +3,15 @@
 from time import time
 from uuid import uuid4
 
+
 class Blockchain:
     def __init__(self):
         # Initialize blockchain as an empty list and pending transactions
         self.chain = []
         self.current_transactions = []
 
         # Create the genesis block
-        self.new_block(previous_hash='1', proof=100)
+        self.new_block(previous_hash="1", proof=100)
 
     def new_block(self, proof, previous_hash=None):
         """
@@ -20,11 +21,11 @@ def new_block(self, proof, previous_hash=None):
         :return: New Block
         """
         block = {
-            'index': len(self.chain) + 1,
-            'timestamp': time(),
-            'transactions': self.current_transactions,
-            'proof': proof,
-            'previous_hash': previous_hash or self.hash(self.chain[-1])
+            "index": len(self.chain) + 1,
+            "timestamp": time(),
+            "transactions": self.current_transactions,
+            "proof": proof,
+            "previous_hash": previous_hash or self.hash(self.chain[-1]),
         }
 
         # Reset the current list of transactions
@@ -41,13 +42,11 @@ def new_transaction(self, sender, recipient, amount):
         :param amount: Amount of the transaction
         :return: The index of the block that will hold this transaction
         """
-        self.current_transactions.append({
-            'sender': sender,
-            'recipient': recipient,
-            'amount': amount
-        })
+        self.current_transactions.append(
+            {"sender": sender, "recipient": recipient, "amount": amount}
+        )
 
-        return self.last_block['index'] + 1
+        return self.last_block["index"] + 1
 
     @staticmethod
     def hash(block):
@@ -79,12 +78,12 @@ def proof_of_work(self, last_proof):
         proof = 0
         while self.valid_proof(last_proof, proof) is False:
             proof += 1
-            
+
             # Add the mining reward here
         self.new_transaction(
             sender="0",  # System or network
             recipient="Miner1",  # Replace with the miner's address
-            amount=1  # Reward amount
+            amount=1,  # Reward amount
         )
         return proof
 
@@ -96,16 +95,17 @@ def valid_proof(last_proof, proof):
         :param proof: Current proof
         :return: True if correct, False if not.
         """
-        guess = f'{last_proof}{proof}'.encode()
+        guess = f"{last_proof}{proof}".encode()
         guess_hash = hashlib.sha256(guess).hexdigest()
         return guess_hash[:4] == "0000"
 
+
 # Create a new blockchain instance
 blockchain = Blockchain()
 
 # Example usage: Add a new transaction and mine a new block
 blockchain.new_transaction(sender="Alice", recipient="Bob", amount=50)
-last_proof = blockchain.last_block['proof']
+last_proof = blockchain.last_block["proof"]
 proof = blockchain.proof_of_work(last_proof)
 block = blockchain.new_block(proof)