python - 未找到 eventlet.green.urllib2 模块

Question

我正在尝试在 http://eventlet.net/doc/examples.html 上运行第一个代码示例，webcrawler.py:

#!/usr/bin/env python
"""
This is a simple web "crawler" that fetches a bunch of urls using a pool to
control the number of outbound connections. It has as many simultaneously open
connections as coroutines in the pool.

The prints in the body of the fetch function are there to demonstrate that the
requests are truly made in parallel.
"""
import eventlet
from eventlet.green import urllib2


urls = [
    "https://www.google.com/intl/en_ALL/images/logo.gif",
    "http://python.org/images/python-logo.gif",
    "http://us.i1.yimg.com/us.yimg.com/i/ww/beta/y3.gif",
]


def fetch(url):
    print("opening", url)
    body = urllib2.urlopen(url).read()
    print("done with", url)
    return url, body


pool = eventlet.GreenPool(200)
for url, body in pool.imap(fetch, urls):
    print("got body from", url, "of length", len(body))

但是，这会导致

ModuleNotFoundError: No module named 'urllib2'

我使用的是 eventlet 版本 0.21.0。该模块已移至 eventlet 中吗？

Answer 1

这些示例似乎已经过时(现在更是如此)。

对于 python 2，使用这个:

import eventlet
from eventlet.green import urllib2 as request

request.urlopen(...)

对于 python 3，使用这个:

import eventlet
from eventlet.green.urllib import request

request.urlopen(...)