How to fix AttributeError: 'Web3' object has no attribute 'toChecksumAddress'?

I’m trying to use 1inch oracle methods from here. This is python wrapper around 1inch apis. I want to know token price from some oracle so i’m using oracle method "get_rate_to_ETH".

But in a result I have this exception:

Traceback (most recent call last):
  File "D:projects1inchArb1inch_api.py", line 20, in <module>
    price_usdc = oracle.get_rate_to_ETH("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48", src_token_decimal=6)
  File "D:projects1inchArbvenvlibsite-packagesoneinch_pymain.py", line 376, in get_rate_to_ETH
    rate = self.oracle_contract.functions.getRateToEth(self.w3.toChecksumAddress(src_token), wrap).call()
AttributeError: 'Web3' object has no attribute 'toChecksumAddress'

My code:

from oneinch_py import OneInchOracle


public_key = "my_wallet_addr"
rpc_url = "https://cloudflare-eth.com"

oracle = OneInchOracle(rpc_url, chain='ethereum')

price_usdc = oracle.get_rate_to_ETH("0xa0b86991c6218b36c1d19d4a2e9eb0ce3606eb48", src_token_decimal=6)

Also I tried to use different RPC urls such as "https://mainnet.infura.io/v3/{}".format(my_infura_key) but it gives same error.

If anyone knows how to help me it would be very grateful…