How can i import keccak with python3?

i am trying to run the following python3 script however i am struggling to get keccak working:

import sha3
import requests
import time



SAFE_ADDRESS = '0x***'
OWNER_PRIVATE_KEY = '****'
DELEGATE_ADDRESS = '****'
TX_SERVICE_BASE_URL = 'https://safe-transaction.rinkeby.gnosis.io'


totp = int(time.time()) // 3600
hash_to_sign = keccak(text=DELEGATE_ADDRESS + str(totp))
account = Account.from_key(OWNER_PRIVATE_KEY)
signature = account.signHash(hash_to_sign)

add_payload = {
    "safe": SAFE_ADDRESS,
    "delegate": DELEGATE_ADDRESS,
    "signature": signature.signature.hex(),
    "label": "My new delegate2"
}

add_response = requests.post(f'{TX_SERVICE_BASE_URL}/api/v1/safes/{SAFE_ADDRESS}/delegates/', json=add_payload, headers = {'Content-type': 'application/json'})

print(add_response.text)
print(add_response.status_code)

i get the following error:

Traceback (most recent call last):
  File "test.py", line 14, in <module>
    hash_to_sign = keccak(text=DELEGATE_ADDRESS + str(totp))
NameError: name 'keccak' is not defined

additionally i have tried to replace import sha3 with from Crypto.Hash import keccak but this time i get this error:

Traceback (most recent call last):
  File "test.py", line 14, in <module>
    hash_to_sign = keccak(text=DELEGATE_ADDRESS + str(totp))
TypeError: 'module' object is not callable

how can i fix this?