<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def _merge_args(qCmd, parsed_args, _extra_values, value_specs):
 """Merge arguments from _extra_values into parsed_args. If an argument value are provided in both and it is a list, the values in _extra_values will be merged into parsed_args. @param parsed_args: the parsed args from known options @param _extra_values: the other parsed arguments in unknown parts @param values_specs: the unparsed unknown parts """

    temp_values = _extra_values.copy()
    for key, value in six.iteritems(temp_values):
        if hasattr(parsed_args, key):
            arg_value = getattr(parsed_args, key)
            if arg_value is not None and value is not None:
                if isinstance(arg_value, list):
                    if value and isinstance(value, list):
                        if (not arg_value or
                                isinstance(arg_value[0], type(value[0]))):
                            arg_value.extend(value)
                            _extra_values.pop(key)