{
  "context": "This criteria evaluates the engineer's proficiency in using web3.py to query Ethereum account balances, including proper connection setup, balance retrieval, unit conversion, and ENS name resolution.",
  "type": "weighted_checklist",
  "checklist": [
    {
      "name": "HTTP Provider Setup",
      "description": "Uses Web3.HTTPProvider to establish a connection to an Ethereum node in the __init__ method",
      "max_score": 15
    },
    {
      "name": "Web3 Instance Creation",
      "description": "Creates a Web3 instance with the configured provider",
      "max_score": 10
    },
    {
      "name": "Connection Check",
      "description": "Uses web3.is_connected() method to verify the connection status in is_connected()",
      "max_score": 15
    },
    {
      "name": "Balance Query in Wei",
      "description": "Uses web3.eth.get_balance() to retrieve account balance in wei in get_balance_wei()",
      "max_score": 20
    },
    {
      "name": "Wei to Ether Conversion",
      "description": "Uses web3.from_wei() with 'ether' unit parameter to convert balance from wei to ether in get_balance_ether()",
      "max_score": 20
    },
    {
      "name": "ENS Name Support",
      "description": "Properly handles ENS names in balance queries (web3.py automatically resolves ENS names when passed to get_balance)",
      "max_score": 10
    },
    {
      "name": "Return Type Correctness",
      "description": "Returns correct types: int for wei, float for ether, bool for connection status",
      "max_score": 10
    }
  ]
}