相关疑难解决方法(0)

什么是幂等操作？

我正在尝试获取此网址的内容" https://itunes.apple.com/in/genre/ios-business/id6000?mt=8 "并显示此错误

import requests
from lxml import html

page = requests.get("https://itunes.apple.com/in/genre/ios-business/id6000?mt=8")
tree = html.fromstring(page.text)

flist = []
plist = []
for i in range(0, 100):
    app = tree.xpath("//div[@class='column first']/ul/li/a/@href")
    ap = app[0]
    page1 = requests.get(ap)

代码是

Traceback (most recent call last):
  File "/home/preetham/Desktop/eg.py", line 17, in <module>
    page1 = requests.get(ap)
  File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 55, in get
    return request('get', url, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/api.py", line 44, in request
    return session.request(method=method, url=url, **kwargs)
  File "/usr/local/lib/python2.7/dist-packages/requests/sessions.py", line 383, in request
    resp = self.send(prep, …

我在Python中使用Kombu来使用持久的RabbitMQ队列.

在Windows中只有一个消费者使用队列.此消费者产生以下错误:

Traceback (most recent call last):
  File ".\consumer_windows.py", line 66, in <module>
    message.ack()
  File "C:\Users\Administrator\Anaconda2\lib\site-packages\kombu\message.py", line 88, in ack
    self.channel.basic_ack(self.delivery_tag)
  File "C:\Users\Administrator\Anaconda2\lib\site-packages\amqp\channel.py", line 1584, in basic_ack
    self._send_method((60, 80), args)
  File "C:\Users\Administrator\Anaconda2\lib\site-packages\amqp\abstract_channel.py", line 56, in _send_method
    self.channel_id, method_sig, args, content,
  File "C:\Users\Administrator\Anaconda2\lib\site-packages\amqp\method_framing.py", line 221, in write_method
    write_frame(1, channel, payload)
  File "C:\Users\Administrator\Anaconda2\lib\site-packages\amqp\transport.py", line 182, in write_frame
    frame_type, channel, size, payload, 0xce,
  File "C:\Users\Administrator\Anaconda2\lib\socket.py", line 228, in meth
    return getattr(self._sock,name)(*args)
error: [Errno 10054] An existing connection was forcibly closed by the remote …

from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.common.exceptions import StaleElementReferenceException, TimeoutException
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.support import expected_conditions as EC
from bs4 import BeautifulSoup
import urllib,requests,unidecode,lxml,pdb
from pyvirtualdisplay import Display
from xvfbwrapper import Xvfb
class wait_for_more_than_n_elements_to_be_present(object):
    def __init__(self, locator, count):
        self.locator = locator
        self.count = count

    def __call__(self, driver):
        try:
            elements = EC._find_elements(driver, self.locator)
            return len(elements) > self.count
        except StaleElementReferenceException:
            return False

def return_html_code(url):
    print url #added in edit 1
    vdisplay =Xvfb()
    vdisplay.start()
    driver = webdriver.Firefox()
    driver.maximize_window() …