human
Solve the following python programming problem given the following code:
@ pytest.fixture 
def throttle_history(expired_throttle_history, retry_after_value) : 
    '
    Contains multiple randomly generated throttle snapshots in storage. There
    is one snapshot where search service has black status and a retry-after
    value.
    ' 
    storage = expired_throttle_history 
    system_stats = ('idle', 'busy', 'overloaded') 
    lights = ('green', 'yellow', 'red') 
    sample_count = 4 
    expected = { 
        
} 
    service_limits = { 
        
} 
    def _range(end, step = (- 10)) : 
        start = (end + ((- step) * (sample_count - 1))) 
        return range (start, (end - 1), step) 
def _services_dicts(limits) : 
        snapshots = [] 
        for i in range (sample_count) : 
            sd = { 
                
} 
            for (k, v) in limits.items () : 
                sd [k] = (choice (lights), v [i]) 
snapshots.append (sd) 
return snapshots 
for (service, limit) in zip (SQLite.SERVICES, (200, 100, 60, 10, 5)) : 
        expected [service] = (60.0 / limit) 
        service_limits [service] = list (_range (limit)) 
        shuffle (service_limits [service]) 
for d in _services_dicts (service_limits) : 
        storage.update (make_header (make_throttle_snapshot (choice (system_stats), d).as_header ())) 
services = list (SQLite.SERVICES) 
    services.remove ('search') 
    services = ', '.join (['{0}=green:1000'.format (s) for s in system_stats]) 
    storage.update (make_header ('{0} (search=black:0, {1})'.format (choice (system_stats), services), retry_after_value)) 
    expected ['search'] = (retry_after_value / 1000.0) 
    th = { 
        'expected' : expected, 
        'storage' : storage, 
} 
    return th 

    
    

    Fix the buggy line: services = ', '.join (['{0}=green:1000'.format (s) for s in system_stats])
assistant
#Here is Python code to fix the buggy line: services = ', '.

services = ', '.join (['{0}=green:1000'.format (s) for s in services])