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

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pre-commit-ci[bot] 2024-10-03 09:49:33 +00:00
parent f5459b8083
commit 95732058fb
1 changed files with 24 additions and 7 deletions
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27
blockchain/PoWAlgorithm.py
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@ -22,6 +22,7 @@ The algorithm implements the Proof of Work (PoW) consensus mechanism used in blo
import hashlib import hashlib
import time import time
class Block: class Block:
def __init__(self, index, previous_hash, transactions, timestamp, difficulty): def __init__(self, index, previous_hash, transactions, timestamp, difficulty):
self.index = index self.index = index
@ -46,13 +47,16 @@ class Block:
Performs Proof of Work by adjusting the nonce until a valid hash is found. Performs Proof of Work by adjusting the nonce until a valid hash is found.
A valid hash has the required number of leading zeros based on the difficulty level. A valid hash has the required number of leading zeros based on the difficulty level.
""" """
target = '0' * self.difficulty # Target hash should start with 'difficulty' number of zeros target = (
while self.hash[:self.difficulty] != target: "0" * self.difficulty
) # Target hash should start with 'difficulty' number of zeros
while self.hash[: self.difficulty] != target:
self.nonce += 1 self.nonce += 1
self.hash = self.compute_hash() self.hash = self.compute_hash()
print(f"Block mined with nonce {self.nonce}, hash: {self.hash}") print(f"Block mined with nonce {self.nonce}, hash: {self.hash}")
class Blockchain: class Blockchain:
def __init__(self, difficulty): def __init__(self, difficulty):
self.chain = [] self.chain = []
@ -72,7 +76,13 @@ class Blockchain:
Adds a new block to the blockchain after performing Proof of Work. Adds a new block to the blockchain after performing Proof of Work.
""" """
previous_block = self.chain[-1] previous_block = self.chain[-1]
new_block = Block(len(self.chain), previous_block.hash, transactions, time.time(), self.difficulty) new_block = Block(
len(self.chain),
previous_block.hash,
transactions,
time.time(),
self.difficulty,
)
new_block.mine_block() new_block.mine_block()
self.chain.append(new_block) self.chain.append(new_block)
@ -95,8 +105,10 @@ class Blockchain:
return True return True
# Test cases # Test cases
def test_blockchain(): def test_blockchain():
""" """
Test cases for the Blockchain proof of work algorithm. Test cases for the Blockchain proof of work algorithm.
@ -112,11 +124,16 @@ def test_blockchain():
assert blockchain.is_chain_valid() == True, "Blockchain should be valid" assert blockchain.is_chain_valid() == True, "Blockchain should be valid"
# Tamper with the blockchain and check validation # Tamper with the blockchain and check validation
blockchain.chain[1].transactions = "Transaction 1: Alice pays Bob 50 BTC" # Tampering the transaction blockchain.chain[
assert blockchain.is_chain_valid() == False, "Blockchain should be invalid due to tampering" 1
].transactions = "Transaction 1: Alice pays Bob 50 BTC" # Tampering the transaction
assert (
blockchain.is_chain_valid() == False
), "Blockchain should be invalid due to tampering"
print("All test cases passed.") print("All test cases passed.")
if __name__ == "__main__": if __name__ == "__main__":
test_blockchain() test_blockchain()