Hi, I want to learn exact formula to get blocks hash where nonce is compatible for network's target requirements.

For example, I want to see formula like this.

SHA256 ("Previous Block Hash + Nonce + Merkel Root + Client Version")

Thank you very much. Have a great day 

A block header contains these fields:
Field    Purpose    Updated when...    Size (Bytes)
Version    Block version number    You upgrade the software and it specifies a new version    4
hashPrevBlock    256-bit hash of the previous block header    A new block comes in    32
hashMerkleRoot    256-bit hash based on all of the transactions in the block    A transaction is accepted    32
Time    Current timestamp as seconds since 1970-01-01T00:00 UTC    Every few seconds    4
Bits    Current target in compact format    The difficulty is adjusted    4
Nonce    32-bit number (starts at 0)    A hash is tried (increments)    4

>>> import hashlib
>>> header_hex = ("01000000" +
 "81cd02ab7e569e8bcd9317e2fe99f2de44d49ab2b8851ba4a308000000000000" +
 "e320b6c2fffc8d750423db8b1eb942ae710e951ed797f7affc8892b0f1fc122b" +
 "c7f5d74d" +
 "f2b9441a" +
 "42a14695")
>>> header_bin = header_hex.decode('hex')
>>> hash = hashlib.sha256(hashlib.sha256(header_bin).digest()).digest()
>>> hash.encode('hex_codec')
'1dbd981fe6985776b644b173a4d0385ddc1aa2a829688d1e0000000000000000'
>>> hash[::-1].encode('hex_codec')
'00000000000000001e8d6829a8a21adc5d38d0a473b144b6765798e61f98bd1d'