EIP712 signatures can generated using the https://eth-account.readthedocs.io/en/stable/eth_account.html#eth_account.messages.encode_structured_data function to encode the EIP712 message, and use web3 to sign it.

msg = { "types": 
{ "EIP712Domain": [], "Type":  []},
  "domain":domain,
  "primaryType": 'Type',
  "message":message }

encoded_data=encode_structured_data(msg)
web3.eth.account.sign_message(encoded_data,privateKey)

https://ethereum.stackexchange.com/questions/114190/how-to-get-eth-signtypeddatav4-signature-in-web3-py

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