小编Ale*_*ron的帖子

from pprint import *

sites = [['a','b','c'],['d','e','f'],[1,2,3]]

pprint(sites)

for site in sites:
        sites.remove(site)

pprint(sites)

输出:

[['a', 'b', 'c'], ['d', 'e', 'f'], [1, 2, 3]]
[['d', 'e', 'f']]

为什么不是None,或者是空列表[]？

有人知道这段代码有什么问题吗？它只是"加载"永远.没有输出."网站"是几十个字符串的列表.

num_worker_threads = 30

def mwRegisterWorker():
    while True:
        try:
            print q.get()
        finally:
            pass

q = multiprocessing.JoinableQueue()
for i in range(num_worker_threads):
     gevent.spawn(mwRegisterWorker)

for site in sites:
    q.put(site)

q.join()  # block until all tasks are done

我有基本的python问题..在下面的例子中没有返回错误但是使用pprint显示所有变量的内容显示内容是='' - 为什么这可能是这种情况？

import sys, os, re, StringIO, pprint, time
from BeautifulSoup import BeautifulSoup, BeautifulStoneSoup
import pycurl

url = "http://google.com/";

strio = StringIO.StringIO()

curlobj = pycurl.Curl()
curlobj.setopt(pycurl.URL, url)
curlobj.perform()
curlobj.close()

contents = strio.getvalue()
strio.close()

有任何想法吗？谢谢