human
Solve the following python programming problem given the following code:
def get_data_sources(job_execution, job, data_source_urls, cluster = None) : 
    def _construct(ctx, ds_id) : 
        source = conductor.data_source_get (ctx, ds_id) 
        if (source and (source.id not in data_source_urls)) : 
            url = _construct_data_source_url (source.url, job_execution.id) 
            runtime_url = _runtime_url (url, cluster) 
            data_source_urls [source.id] = (url, runtime_url) 
return source 
ctx = context.ctx () 
    input_source = _construct (ctx, data_source_urls.input_id) 
    output_source = _construct (ctx, job_execution.output_id) 
    return (input_source, output_source) 

    
    

    Fix the buggy line: input_source = _construct (ctx, data_source_urls.input_id)
assistant
#Here is Python program to fix the buggy line: input_source = _construct (ctx, data_source_urls.

input_source = _construct (ctx, job_execution.input_id)