dpaste/1OaGn (Python)

with ThreadPoolExecutor(max_workers=NUM_CONCURRENT) as executor:
futures = {executor.submit(send_request, idx, url, data, headers) for idx, data in enumerate(data_list , 1)}
concurrent.futures.wait(futures, return_when=concurrent.futures.FIRST_EXCEPTION)

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Content with ThreadPoolExecutor(max_workers=NUM_CONCURRENT) as executor: futures = {executor.submit(send_request, idx, url, data, headers) for idx, data in enumerate(data_list , 1)} concurrent.futures.wait(futures, return_when=concurrent.futures.FIRST_EXCEPTION)