I want to add finded hash to txt file

[Mert-Zengin]

   hash = hashlib.sha256(hashlib.sha256(binascii.unhexlify(blockheader)).digest()).digest()
    hash = binascii.hexlify(hash).decode()
#    print('hash: {}'.format(hash))
    if(hash[:5] == '00000'): print('hash: {}'.format(hash))
    if hash < target :
#    if(hash[:10] == '0000000000'):
	#file = open("buldu.txt", "a")
	#file.write('hash:{}'.format(hash)) <------- i added but didn't work 
	#file.close()
        print('success!!')
        print('hash: {}'.format(hash))
        payload = bytes('{"params": ["'+address+'", "'+job_id+'", "'+extranonce2 \
            +'", "'+ntime+'", "'+nonce+'"], "id": 1, "method": "mining.submit"}\n', 'utf-8')
        sock.sendall(payload)
        print(sock.recv(1024))
#    else:
#        print('failed mine, hash is greater than target')

when i try to add getting error tab

[iceland2k14]

This file code you added will be triggered only when you get the BTC Block. because it is inside the condition if hash < target
If you want to look at all the hash generated during computation in a file then you can output it below the Line 80.

solominer/solo_miner.py

Lines 80 to 81 in 6e2e1f6

	hash = binascii.hexlify(hash).decode()
	# print('hash: {}'.format(hash))

Put the code there you will see the hashes saved in your file.