set timeout while spidering a site

Though I heavily depend on urllib2 module to develop web crawler, but sometimes the crawlers just stuck ... :(. So it's necessary to set a timeout but unfortunately urllib2 doesn't provide anything for this purpose. So we have to depend on socket module. here is the code that I use:


import socket

timeout = 300 # seconds
socket.setdefaulttimeout(timeout)

Comments

redbaron said…
What perfomance (sites/day) did you achieve with your crawlers?
September 7, 2008 at 2:36 AM
Post a Comment

Popular posts from this blog

Strip HTML tags using Python

We often need to strip HTML tags from string (or HTML source). I usually do it using a simple regular expression in Python. Here is my function to strip HTML tags: def remove_html_tags(data): p = re.compile(r'<.*?>') return p.sub('', data) Here is another function to remove more than one consecutive white spaces: def remove_extra_spaces(data): p = re.compile(r'\s+') return p.sub(' ', data) Note that re module needs to be imported in order to use regular expression. Here you can find an updated code that gets the text from html: http://love-python.blogspot.com/2011/04/html-to-text-in-python.html
Read more

lambda magic to find prime numbers

Find prime number up to 100 with just 3 lines of code. The 4th line is for printing ;) nums = range(2, 100) for i in range(2, 10):     nums = filter(lambda x: x == i or x % i, nums) print nums Isn't it amazing? Check my new post about Prime number: http://love-python.blogspot.com/2010/11/prime-number-generator-in-python-using.html
Read more

Convert text to ASCII and ASCII to text - Python code

Python has a very simple way to convert text to ASCII and ASCII to text. To find the ASCII value of a character use the ord() function. Example: >>> ord('B') 66 To get a character from it's ASCII value use the chr() function. Example: >>> chr(65) 'A' Here is a program to get the list of all characters along with their values: # program to print the list of characters and their ASCII values for value in range(0, 255): print "ASCII Value:", value, "\t", "Character:", chr(value), "\n" Here is another simple ASCII encoding-decoding program: # Convertion from text to ASCII codes message = raw_input("Enter message to encode: ") print "Decoded string (in ASCII):" for ch in message: print ord(ch), print "\n\n" # Convertion from ASCII codes to text message = raw_input("Enter ASCII codes: ") decodedMessage = "" for item in message.split(): decodedMessage += chr
Read more