def approve(ctx, _spender='<STR_LIT:address>', _value='<STR_LIT>', returns=STATUS):
ctx.allowances[ctx.msg_sender][_spender] += _value<EOL>ctx.Approval(ctx.msg_sender, _spender, _value)<EOL>return OK<EOL>
Standardized Contract API:
        function approve(address _spender, uint256 _value) returns (bool success)