Hi, I am a beginner in python. I am working on blockchain and I am trying to transfer hashes through socket programming but on the client-side, I am receiving nothing. Can anyone please help me if this work can be done through a database like i can store hashes on a local database kindly guide me 

Thank you.

import socket
import pandas as pd
import pickle
import hashlib

df = pd.read_csv(r"C:\Users\DELL\OneDrive\Desktop\mythesisdataset.csv",
                 names=[ 'SBP', 'DBP', 'HEARTRATE', "Temperature" ])
normal_df = (df [ (df.SBP > 120) & (df.DBP > 90) & (df.HEARTRATE < 100) & (df [ 'Temperature' ] < 100) ])


class Block:
    def __init__( self, previous_block_hash, transaction_list ):
        self.previous_block_hash = previous_block_hash
        self.transaction_list = transaction_list

        self.block_data = f"{' - '.join(transaction_list)} - {previous_block_hash}"
        self.block_hash = hashlib.sha256(self.block_data.encode()).hexdigest()


class Blockchain:
    def __init__( self ):
        self.chain = [ ]
        self.generate_genesis_block()

    def generate_genesis_block( self ):
        self.chain.append(Block("0", [ 'Genesis Block' ]))

    def create_block_from_transaction( self, transaction_list ):
        previous_block_hash = self.last_block.block_hash
        self.chain.append(Block(previous_block_hash, transaction_list))

    def display_chain( self ):
        for i in range(len(self.chain)):
            print(f"Hash {i + 1}: {self.chain [ i ].block_hash}\n")

    @property
    def last_block( self ):
        return self.chain [ -1 ]


t1 = "abcdergfhiklm"
t2 = "abcdefghijklmnopqrstuvwxyz"
t3 = normal_df

myblockchain = Blockchain()
myblockchain.create_block_from_transaction(t1)
myblockchain.create_block_from_transaction(t2)
myblockchain.create_block_from_transaction(t3)
myblockchain.display_chain()
print(myblockchain.display_chain())


while True:
    s = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
    host = socket.gethostname()
    port = 5007
    s.bind((host, port))

    print("host name:", host, " socket name:", socket)

    s.listen()
    c, addr = s.accept()
    # print('Got connection from', addr, '...')
    df2 = pickle.dumps(myblockchain.display_chain())
    c.send(df2)

    c.close()  # Close the connection


Client side 

import pickle
import socket

sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)

try:
    # Connect to server and send data
    sock.connect((socket.gethostname(), 5007))

    # Receive data from the server and shut down
    data = (sock.recv(4096))
    #df3 = pickle.loads(data)
    print("Hash receive")
    print(data)
finally:
    sock.close()