Question

我试图废弃电子商务网站（在本例中为Flipkart）网页上列出的所有产品的标题。现在，我要抓的产品将取决于用户输入的关键字。如果我输入了产品＆＃39; XYZXYZ＆＃39;将是：

http://www.flipkart.com/search?q=XYXXYZ&as=off&as-show=on&otracker=start

现在，使用此链接作为模板，我编写了以下脚本，根据输入的关键字删除任何指定网页下列出的所有产品的标题：

import requests
from bs4 import BeautifulSoup

def flipp(k):
    url = "http://www.flipkart.com/search?q=" + str(k) + "&as=off&as-show=on&otracker=start"
    ss = requests.get(url)
    src = ss.text
    obj = BeautifulSoup(src)
    for e in obj.findAll("a", {'class' : 'lu-title'}):
        title = e.string
        print unicode(title)

h = raw_input("Enter a keyword:")
print flipp(h)

但是，上面的脚本返回None作为输出。当我尝试在每一步调试时，我发现requests模块无法获取网页的源代码。这里似乎发生了什么？

Answer 1

这就是诀窍，

import requests
from bs4 import BeautifulSoup
import re

def flipp(k):
    url = "http://www.flipkart.com/search?q=" + str(k) + "&as=off&as-show=on&otracker=start"
    ss = requests.get(url)
    src = ss.text
    obj = BeautifulSoup(src)
    for e in obj.findAll("a",class_=re.compile("-title")):
        title = e.text
        print title.strip()

h = raw_input("Enter a keyword:") # I used 'Python' here
print flipp(h)

Out[1]:
Think Python (English) (Paperback)
Learning Python (English) 5th  Edition (Hardcover)
Python in Easy Steps : Makes Programming Fun ! (English) 1st Edition (Paperback)
Python : The Complete Reference (English) (Paperback)
Natural Language Processing with Python (English) 1st Edition (Paperback)
Head First Programming: A learner's guide to programming using the Python language (English) 1st  Edition (Paperback)
Beginning Python (English) (Paperback)
Programming Python (English) 4Th Edition (Hardcover)
Computer Science with Python Language Made Simple - (Class XI) (English) (Paperback)
HEAD FIRST PYTHON (English) (Paperback)
Raspberry Pi User Guide (English) (Paperback)
Core Python Applications Programming (English) 3rd  Edition (Paperback)
Write Your First Program (English) (Paperback)
Programming Computer Vision with Python (English) 1st Edition (Paperback)
An Introduction to Python (English) (Paperback)
Fundamentals of Python: Data Structures (English) (Paperback)
Think Complexity (English) (Paperback)
Foundations of Python Network Programming: The comprehensive guide to building network applications with Python (English) 2nd Edition (Soft Cover)
Python Programming for the Absolute Beginner (English) (Paperback)
EXPERT PYTHON PROGRAMMING BEST PRACTICES FOR DESIGNING,CODING & DISTRIBUTING YOUR PYTHON 1st Edition (Paperback)
None

Answer 2

问题是flipp没有return语句，因此您打印None（这是没有{{1}时任何Python函数的默认返回值声明）。

可能是你正在使用没有结果的关键字，但我正在使用该脚本获得回页。

从动态电子商务网站刮取数据

2 个答案: