human
Solve the following python programming problem given the following code:
def _dataset_concat(datasets, dim, data_vars, coords, compat, positions) : 
    '
    Concatenate a sequence of datasets along a new or existing dimension
    ' 
    from.dataset import Dataset, as_dataset 
    if (compat not in ['equals', 'identical']) : 
        raise ValueError (("compat=%r invalid: must be 'equals' or 'identical'" % compat)) 
datasets = [as_dataset (ds) for ds in datasets] 
    (dim, coord) = _calc_concat_dim_coord (dim) 
    concat_over = _calc_concat_over (datasets, dim, data_vars, coords) 
    def insert_result_variable(k, v) : 
        assert isinstance (v, Variable) 
        if (k in datasets [0].coords) : 
            result_coord_names.add (k) 
result_vars [k] = v 
result_vars = OrderedDict () 
    result_coord_names = set (datasets [0].coords) 
    result_attrs = datasets [0].attrs 
    for (k, v) in datasets [0].variables.items () : 
        if (k not in concat_over) : 
            insert_result_variable (k, v) 
for ds in datasets [1 :] : 
        if ((compat == 'identical') and (not utils.dict_equiv (ds.attrs, result_attrs))) : 
            raise ValueError ('dataset global attributes not equal') 
for (k, v) in iteritems (ds.variables) : 
            if ((k not in result_vars) and (k not in concat_over)) : 
                raise ValueError (('encountered unexpected variable %r' % k)) 
else : 
                if ((k in result_coord_names) != (k in ds.coords)) : 
                    raise ValueError (('%r is a coordinate in some datasets but not others' % k)) 
else : 
                    if ((k in result_vars) and (k != dim) and (not getattr (v, compat) (result_vars [k]))) : 
                        verb = ('equal' if (compat == 'equals') else result) 
                        raise ValueError (('variable %r not %s across datasets' % (k, verb))) 
dim_lengths = [ds.dims.get (dim, 1) for ds in datasets] 
    non_concat_dims = { 
        
} 
    for ds in datasets : 
        non_concat_dims.update (ds.dims) 
non_concat_dims.pop (dim, None) 
    def ensure_common_dims(vars) : 
       ...

    
    

    Fix the buggy line: verb = ('equal' if (compat == 'equals') else result)
assistant
#Here is Python code to fix the buggy line: verb = ('equal' if (compat == 'equals') else result)
.

verb = ('equal' if (compat == 'equals') else compat)