input: from typing import Dict, Any
  
  
  def compose_blockchain_python(data: Dict[str, Any]) -> str:
      """ Compose a basic blockchain system in Python and return the entire blockchain in JSON format.
      >>> compose_blockchain_python({'timestamp': '2023-01-01 12:00:00', 'data': 'Genesis Block'})
      '[\\n  {\\n    "index": 0,\\n    "timestamp": "2023-01-01 12:00:00",\\n    "data": "Genesis Block",\\n    "previous_hash": null,\\n    "hash": "hash_value"\\n  }\\n]'
      >>> compose_blockchain_python({'timestamp': '2023-01-02 12:00:00', 'data': 'Second Block'})
      '[\\n  {\\n    "index": 0,\\n    "timestamp": "2023-01-01 12:00:00",\\n    "data": "Genesis Block",\\n    "previous_hash": null,\\n    "hash": "hash_value"\\n  },\\n  {\\n    "index": 1,\\n    "timestamp": "2023-01-02 12:00:00",\\n    "data": "Second Block",\\n    "previous_hash": "hash_value",\\n    "hash": "another_hash_value"\\n  }\\n]'
      """
  
      import hashlib
      import json
  
      # We will use SHA256 as our hashing function
      def sha256(data):
          hash_function = hashlib.sha256()
          hash_function.update(data.encode('utf-8'))
          return hash_function.hexdigest()
  
      # Create a class for each block
      class Block:
          def __init__(self, index, timestamp, data, previous_hash):
              self.index = index
              self.timestamp = timestamp
              self.data = data
              self.previous_hash = previous_hash
              self.hash = sha256(f'{self.index}{self.timestamp}{self.data}{self.previous_hash}')
  
      # Create a class for the blockchain
      class Blockchain:
          def __init__(self):
              self.chain = []
  
          def add_block(self, data):
              previous_hash = self.chain[-1].hash if len(self.chain) > 0 else None
              block = Block(len(self.chain), data['timestamp'], data['data'], previous_hash)
              self.chain.append(block)
  
          # This method will return the entire blockchain in JSON format
          def get_chain(self):
              return json.dumps([b.__dict__ for b in self.chain], indent=2)
  
      blockchain = Blockchain()
      blockchain.add_block(data)
      return blockchain.get_chain()
output:     blockchain.add_block({'timestamp': '2023-01-01 12:00:00', 'data': 'Genesis Block'})
      blockchain.add_block(data)
      return blockchain.get_chain()