Web3.py: web3.exceptions.InvalidAddress: ('Address has an invalid EIP checksum', '0x...')

[avatar-lavventura]

• pip 9.0.3
• Python: 3.5.2
• OS: linux (ubuntu)

### pip install:
$ sudo apt-get install python3-pip
$ sudo pip3 install virtualenv
#once
$ virtualenv -p python3 ~/.venv-py3
# each session:
$ source ~/.venv-py3/bin/activate

Current session is: (.venv-py3) user$

python file:

#!/usr/bin/env python

from __future__ import print_function
from web3 import Web3
#from web3.auto import w3
import json, sys, os
from web3.providers.rpc import HTTPProvider

os.chdir(sys.path[0]);

web3 = Web3(HTTPProvider('http://localhost:8545'))

fileAddr = open("address.json", "r")
contractAddress = fileAddr.read().replace("\n", "")

with open('abi.json', 'r') as abi_definition:
    abi = json.load(abi_definition)

smartContract = web3.eth.contract(contractAddress, abi=abi); #<====Error occurs!!!!

When I use following line on my python file:
smartContract = web3.eth.contract(contractAddress, abi=abi);

I receive the following error:

Traceback (most recent call last):
  File "getClusterAddresses.py", line 19, in <module>
    eBlocBroker = web3.eth.contract(contractAddress, abi=abi);
  File "/home/alper/.venv-py3/lib/python3.5/site-packages/web3/eth.py", line 350, in contract
    return ContractFactory(address)
  File "/home/alper/.venv-py3/lib/python3.5/site-packages/web3/contract.py", line 200, in __init__
    self.address = normalize_address(self.web3.ens, address)
  File "/home/alper/.venv-py3/lib/python3.5/site-packages/web3/utils/normalizers.py", line 160, in normalize_address
    validate_address(address)
  File "/home/alper/.venv-py3/lib/python3.5/site-packages/web3/utils/validation.py", line 116, in validate_address
    raise InvalidAddress("Address has an invalid EIP checksum", value)
web3.exceptions.InvalidAddress: ('Address has an invalid EIP checksum', '0xfe80e4c67dc34539f2fe2ea88277635f9f809fc4')

[dangell7]

If you’re pulling the address from a database I would suggest using web3.toChecksumAddress(dbAddress).

Honestly, I always use the toChecksum just Incase.

[avatar-lavventura]

I am actually reading it from a file. For example abi.json contains the abi of the smart-contract and address.js contains its address. Should I do: dbAddress = web3.toChecksumAddress(dbAddress) ? @dangell7

[dangell7]

Always.

[avatar-lavventura]

Wow it worked, thanks!! Should I do it also for abi? @dangell7

[dangell7]

No not for the abi. Just for any address that doesn’t come directly from web3 or metamask. Glad to help tho. If you want more. Here is my repo. Https://github.com/samyagency/samy