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from web3 import Web3
import json
from web3.providers.rpc import HTTPProvider
contractAddress = '0xmasked'
web3 = Web3(HTTPProvider('https://mainnet.infura.io'))
with open('contract.abi', 'r') as abi_definition:
    abi = json.load(abi_definition)


fContract = web3.eth.contract(abi,contractAddress)

Has anyone encountered the following error? From what I see I'm calling two arguments not three.

TypeError: contract() takes from 1 to 2 positional arguments but 3 were given
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  • could you print the variable abi and share the output ? – Chim Jan 15 '18 at 12:02
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    One more thing, suggest to connect to a testnet instead of mainnet in infura – Chim Jan 15 '18 at 12:03
  • Based on that message, it seems you are on web3.py version 4 (beta). Can you confirm the exact version? – carver Jan 15 '18 at 17:46
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In web3.py v4 (which I'm guessing you're on, based on the error), only the address can be passed as a positional argument.

To resolve the issue, initialize the contract with the ABI passed as a keyword argument, like so:

fContract = web3.eth.contract(contractAddress, abi=abi)
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