Keccak is a family of cryptographic hash algorithms that won the SHA-3 competition organized by NIST. What eventually became SHA-3 (FIPS 202) is a slight variant: though incompatible to Keccak, the security principles and margins remain the same.
If you are interested in writing SHA-3 compliant code, you must use the modules Crypto.Hash.SHA3_224, Crypto.Hash.SHA3_256, Crypto.Hash.SHA3_384 or Crypto.Hash.SHA3_512.
This module implements the Keccak hash functions for the 64 bit word length (b=1600) and the fixed digest sizes of 224, 256, 384 and 512 bits.
This is an example:
>>> from Crypto.Hash import keccak
>>>
>>> keccak_hash = keccak.new(digest_bits=512)
>>> keccak_hash.update(b'Some data')
>>> print keccak_hash.hexdigest()Crypto.Hash.keccak