code: def from_pubsec_file(cls: Type[SigningKeyType], path: str) -> SigningKeyType:
          
          with open(path, 'r') as fh:
              pubsec_content = fh.read()
  
          # line patterns
          regex_pubkey = compile("pub: ([1-9A-HJ-NP-Za-km-z]{43,44})", MULTILINE)
          regex_signkey = compile("sec: ([1-9A-HJ-NP-Za-km-z]{88,90})", MULTILINE)
  
          # check public key field
          match = search(regex_pubkey, pubsec_content)
          if not match:
              raise Exception('Error: Bad format PubSec v1 file, missing public key')
  
          # check signkey field
          match = search(regex_signkey, pubsec_content)
          if not match:
              raise Exception('Error: Bad format PubSec v1 file, missing sec key')
  
          # capture signkey
          signkey_hex = match.groups()[0]
  
          # extract seed from signkey
          seed = bytes(Base58Encoder.decode(signkey_hex)[0:32])
  
          return cls(seed)
docs: Return SigningKey instance from Duniter WIF file
  
          :param path: Path to WIF file