text: from __future__ import absolute_import
  
  try:
      from sha3 import keccak_256
  except ImportError:
      from sha3 import sha3_256 as keccak_256
  
  from .string import (
      force_bytes,
  )
  
  
  def keccak(value):
      return keccak_256(force_bytes(value)).digest()
  
  
  # ensure we have the *correct* hash function
  assert keccak('') == b"\xc5\xd2F\x01\x86\xf7#<\x92~}\xb2\xdc\xc7\x03\xc0\xe5\x00\xb6S\xca\x82';{\xfa\xd8\x04]\x85\xa4p"  # noqa: E501
  