This script use etherscan.io API to fetch Ethereum addresses balance

python3 ethBalance.py -F input_addresses_file_path -O output_file

OR:

python3 ethBalance.py --file input_addresses_file_path --out output_file

You can put your own etherscan.io API_Key in :

self.API_TOKEN = "_Your_API_Token"

For more info about etherscan API_Key please visit this link: etherscan.io