Python - 非常简单的多线程并行URL提取（没有队列） [英] Python - very simple multithreading parallel URL fetching (without queue)

问题描述

我花了一整天时间在Python中寻找最简单的可能的多线程网址获取器，但我发现大多数脚本都使用了队列或多处理或复杂的库。

I spent a whole day looking for the simplest possible multithreaded URL fetcher in Python, but most scripts I found are using queues or multiprocessing or complex libraries.

写了一个自己，我报告为答案。请随时提出任何改进建议。

Finally I wrote one myself, which I am reporting as an answer. Please feel free to suggest any improvement.

我猜其他人可能一直在寻找类似的东西。

I guess other people might have been looking for something similar.

推荐答案

尽可能简化原始版本：

import threading
import urllib2
import time

start = time.time()
urls = ["http://www.google.com", "http://www.apple.com", "http://www.microsoft.com", "http://www.amazon.com", "http://www.facebook.com"]

def fetch_url(url):
    urlHandler = urllib2.urlopen(url)
    html = urlHandler.read()
    print "'%s\' fetched in %ss" % (url, (time.time() - start))

threads = [threading.Thread(target=fetch_url, args=(url,)) for url in urls]
for thread in threads:
    thread.start()
for thread in threads:
    thread.join()

print "Elapsed Time: %s" % (time.time() - start)

这里唯一的新技巧是：

• 跟踪您创建的主题。


• 如果你只是想知道他们什么时候完成， 加入已经告诉你。


• 如果你不需要任何状态或外部API，你不需要线程子类，只是一个目标函数。

• Keep track of the threads you create.
• Don't bother with a counter of threads if you just want to know when they're all done; join already tells you that.
• If you don't need any state or external API, you don't need a Thread subclass, just a target function.

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