I am trying to follow this example: https://github.com/ethereum/pyethapp/wiki/The_Console

However, at the point where I should compile the code, I get an error:

In [34]: print c
contract NameReg{
    event AddressRegistered(bytes32 indexed name, address indexed account);
    mapping(address => bytes32) toName;

    function register(bytes32 name){
        toName[msg.sender] = name;
        AddressRegistered(name, msg.sender);

    function resolve(address addr) constant returns(bytes32 name){
        return toName[addr];

In [35]: solidity.compile(c)
IndexError                                Traceback (most recent call last)
<ipython-input-35-7d9906629614> in <module>()
----> 1 solidity.compile(c)

/home/work/Software/ethereum/pyethapp/.venv/local/lib/python2.7/site-packages/ethereum/_solidity.pyc in compile(cls, code, path, libraries, contract_name)
     51                 sorted_contracts[idx][1]['bin'] = sorted_contracts[idx][1]['bin'].replace(
     52                     "__{}{}".format(lib_name, "_" * (38 - len(lib_name))), lib_address)
---> 53         return sorted_contracts[idx][1]['bin'].decode('hex')
     55     @classmethod

IndexError: list index out of range

I get that there is an argument missing to the 'compile' call, but which one? What's the class that I should provide?

  • Have you explicitly imported the Solidity package? (Using import ethereum._solidity?) – Richard Horrocks Jun 13 '16 at 17:38
  • What version of pyethapp are you using? – Noel Maersk Apr 28 '17 at 14:04
  • Are you using an IDE such as Spyder? If so you may have to install it for the IDE instead of your computer's python environment. – Fortune Nov 27 '17 at 6:06

you need to import the solidity version. example :

pragma solidity ^0.4.18;
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