使用map
# example4.pyimport concurrent.futuresimport urllib.requestURLS = ['http://httpbin.org', 'http://example.com/', 'https://api.github.com/']def load_url(url): with urllib.request.urlopen(url, timeout=60) as conn: return conn.read()# We can use a with statement to ensure threads are cleaned up promptlywith concurrent.futures.ThreadPoolExecutor(max_workers=3) as executor: for url, data in zip(URLS, executor.map(load_url, URLS)): print('%r page is %d bytes' % (url, len(data)))从运行结果可以看出， 结果是按照列表的顺序返回的 。
ziwenxie :: ~ » python example4.py'http://httpbin.org' page is 12150 bytes'http://example.com/' page is 1270 bytes'https://api.github.com/' page is 2039 bytes