TypeError: 'property' object is not callable

[Netherdrake]

• Version: web3-py latest

pip install -U web3
...
Successfully installed eth-keys-0.1.0b4 eth-utils-0.8.1

• Python: 3.6
• OS: osx and linux

What was wrong?

Signature class won't initialize. It fails with error:

TypeError: 'property' object is not callable

[pipermerriam]

Please provide full stack trace as well as the code that causes the error.

[Netherdrake]

def recover_address(data: Union[str, bytes], signature: str) -> str:
    signature = binascii.unhexlify(remove_0x_prefix(signature))
    if type(data) == str:
        data = keccak(text=data)

    # web3js outputs in rsv order
    vrs = (
        ord(signature[64:65]) - 27,
        big_endian_to_int(signature[0:32]),
        big_endian_to_int(signature[32:64]),
    )
    sig = KeyAPI.Signature(vrs=vrs)
    return sig.recover_public_key_from_msg(data).to_address()

This works fine in eth-keys-0.2.0b3.

However in current web3 pypi package, I get:

data = b'A\xb1\xa0d\x97R\xaf\x1b(\xb3\xdc)\xa1Un\xeex\x1eJL:\x1f\x7fS\xf9\x0f\xa84\xde\t\x8cM'
signature = b'B\x0f5Qu\xb5\xc2\xa9h-\xde\x10r\xa9X\xfb\x19;\xdc\xef\x84\x9c\x02\xf0\x90\x00\x19I)\x08\x86B\x17\x81\\\x1ej\xa2\x84\xfa\x83Y\xbc\x02\x06@\xf2tiR\x1e,\xd5\x89\xee\x86\xa6\xb4\x18!\xf1\xc2T\xd3\x1b'

    def recover_address(data: Union[str, bytes], signature: str) -> str:
        signature = binascii.unhexlify(remove_0x_prefix(signature))
        if type(data) == str:
            data = keccak(data)
    
        # web3js outputs in rsv order
        vrs = (
            ord(signature[64:65]) - 27,
            big_endian_to_int(signature[0:32]),
            big_endian_to_int(signature[32:64]),
        )
>       sig = KeyAPI.Signature(vrs=vrs)
E       TypeError: 'property' object is not callable

../../src/core/eth.py:52: TypeError

[pipermerriam]

You should go look up the API in the README.md. You are trying to use the KeyAPI class directly however it needs to be instantiated (at least in the older versions of the library).

See docs here: https://github.com/ethereum/eth-keys#keyapibackendnone