For Loop for scraping emails for mulitple urls - BS - for-loop

Below is the code for scraping emails for a single base url and I have been cracking my head on getting a simple "for loop" to do it for an array of urls or reading a list of urls (csv) into python. Can anyone modify the code so that it will do the job?
import requests
import re
from bs4 import BeautifulSoup
allLinks = [];mails=[]
url = 'https://www.smu.edu.sg/'
response = requests.get(url)
soup=BeautifulSoup(response.text,'html.parser')
links = [a.attrs.get('href') for a in soup.select('a[href]') ]
allLinks=set(links)
def findMails(soup):
for name in soup.find_all('a'):
if(name is not None):
emailText=name.text
match=bool(re.match('[a-zA-Z0-9_.+-]+#[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$',emailText))
if('#' in emailText and match==True):
emailText=emailText.replace(" ",'').replace('\r','')
emailText=emailText.replace('\n','').replace('\t','')
if(len(mails)==0)or(emailText not in mails):
print(emailText)
mails.append(emailText)
for link in allLinks:
if(link.startswith("http") or link.startswith("www")):
r=requests.get(link)
data=r.text
soup=BeautifulSoup(data,'html.parser')
findMails(soup)
else:
newurl=url+link
r=requests.get(newurl)
data=r.text
soup=BeautifulSoup(data,'html.parser')
findMails(soup)
mails=set(mails)
if(len(mails)==0):
print("NO MAILS FOUND")

Related

Scrapes Emails from a list of URLs saved in CSV - BeautifulSoup

I am trying to parse thru a list of URLs saved in CSV format to scrape email addresses. However, the below code only managed to fetch email addresses from a single website. Need advice on how to modify the code to loop thru the list and save the outcome (the list of emails) to csv file.
import requests
import re
import csv
from bs4 import BeautifulSoup
allLinks = [];mails=[]
with open(r'url.csv', newline='') as csvfile:
urls = csv.reader(csvfile, delimiter=' ', quotechar='|')
links = []
for url in urls:
response = requests.get(url)
soup=BeautifulSoup(response.text,'html.parser')
links = [a.attrs.get('href') for a in soup.select('a[href]') ]
allLinks=set(links)
def findMails(soup):
for name in soup.find_all('a'):
if(name is not None):
emailText=name.text
match=bool(re.match('[a-zA-Z0-9_.+-]+#[a-zA-Z0-9-]+\.[a-zA-Z0-9-.]+$',emailText))
if('#' in emailText and match==True):
emailText=emailText.replace(" ",'').replace('\r','')
emailText=emailText.replace('\n','').replace('\t','')
if(len(mails)==0)or(emailText not in mails):
print(emailText)
mails.append(emailText)
for link in allLinks:
if(link.startswith("http") or link.startswith("www")):
r=requests.get(link)
data=r.text
soup=BeautifulSoup(data,'html.parser')
findMails(soup)
else:
newurl=url+link
r=requests.get(newurl)
data=r.text
soup=BeautifulSoup(data,'html.parser')
findMails(soup)
mails=set(mails)
if(len(mails)==0):
print("NO MAILS FOUND")
You are overwriting links when you want to add to it.
allLinks = [];mails=[]
urls = ['https://www.nus.edu.sg/', 'http://gwiconsulting.com/']
links = []
for url in urls:
response = requests.get(url)
soup=BeautifulSoup(response.text,'html.parser')
links += [a.attrs.get('href') for a in soup.select('a[href]') ]
allLinks=set(links)
At end loop your mails and write to csv
import csv
with open("emails.csv", "w", encoding="utf-8-sig", newline='') as csv_file:
w = csv.writer(csv_file, delimiter = ",", quoting=csv.QUOTE_MINIMAL)
w.writerow(['Email'])
for mail in mails:
w.writerow(mail)

Possible to replace Scrapy's default lxml parser with Beautiful Soup's html5lib parser?

Question: Is there a way to integrate BeautifulSoup's html5lib parser into a scrapy project--instead of the scrapy's default lxml parser?
Scrapy's parser fails (for some elements) of my scrape pages.
This only happens every 2 out of 20 pages.
As a fix, I've added BeautifulSoup's parser to the project (which works).
That said, I feel like I'm doubling the work with conditionals and multiple parsers...at a certain point, what's the reason for using Scrapy's parser? The code does work....it feels like a hack.
I'm no expert--is there a more elegant way to do this?
Much appreciation in advance
Update: Adding a middleware class to scrapy (from the python package scrapy-beautifulsoup) works like a charm. Apparently, lxml from Scrapy is not as robust as BeautifulSoup's lxml. I didn't have to resort to the html5lib parser--which is 30X+ slower.
class BeautifulSoupMiddleware(object):
def __init__(self, crawler):
super(BeautifulSoupMiddleware, self).__init__()
self.parser = crawler.settings.get('BEAUTIFULSOUP_PARSER', "html.parser")
#classmethod
def from_crawler(cls, crawler):
return cls(crawler)
def process_response(self, request, response, spider):
"""Overridden process_response would "pipe" response.body through BeautifulSoup."""
return response.replace(body=str(BeautifulSoup(response.body, self.parser)))
Original:
import scrapy
from scrapy.item import Item, Field
from scrapy.loader.processors import TakeFirst, MapCompose
from scrapy import Selector
from scrapy.loader import ItemLoader
from w3lib.html import remove_tags
from bs4 import BeautifulSoup
class SimpleSpider(scrapy.Spider):
name = 'SimpleSpider'
allowed_domains = ['totally-above-board.com']
start_urls = [
'https://totally-above-board.com/nefarious-scrape-page.html'
]
custom_settings = {
'ITEM_PIPELINES': {
'crawler.spiders.simple_spider.Pipeline': 400
}
}
def parse(self, response):
yield from self.parse_company_info(response)
yield from self.parse_reviews(response)
def parse_company_info(self, response):
print('parse_company_info')
print('==================')
loader = ItemLoader(CompanyItem(), response=response)
loader.add_xpath('company_name',
'//h1[contains(#class,"sp-company-name")]//span//text()')
yield loader.load_item()
def parse_reviews(self, response):
print('parse_reviews')
print('=============')
# Beautiful Soup
selector = Selector(response)
# On the Page (Total Reviews) # 49
search = '//span[contains(#itemprop,"reviewCount")]//text()'
review_count = selector.xpath(search).get()
review_count = int(float(review_count))
# Number of elements Scrapy's LXML Could find # 0
search = '//div[#itemprop ="review"]'
review_element_count = len(selector.xpath(search))
# Use Scrapy or Beautiful Soup?
if review_count > review_element_count:
# Try Beautiful Soup
soup = BeautifulSoup(response.text, "lxml")
root = soup.findAll("div", {"itemprop": "review"})
for review in root:
loader = ItemLoader(ReviewItem(), selector=review)
review_text = review.find("span", {"itemprop": "reviewBody"}).text
loader.add_value('review_text', review_text)
author = review.find("span", {"itemprop": "author"}).text
loader.add_value('author', author)
yield loader.load_item()
else:
# Try Scrapy
review_list_xpath = '//div[#itemprop ="review"]'
selector = Selector(response)
for review in selector.xpath(review_list_xpath):
loader = ItemLoader(ReviewItem(), selector=review)
loader.add_xpath('review_text',
'.//span[#itemprop="reviewBody"]//text()')
loader.add_xpath('author',
'.//span[#itemprop="author"]//text()')
yield loader.load_item()
yield from self.paginate_reviews(response)
def paginate_reviews(self, response):
print('paginate_reviews')
print('================')
# Try Scrapy
selector = Selector(response)
search = '''//span[contains(#class,"item-next")]
//a[#class="next"]/#href
'''
next_reviews_link = selector.xpath(search).get()
# Try Beautiful Soup
if next_reviews_link is None:
soup = BeautifulSoup(response.text, "lxml")
try:
next_reviews_link = soup.find("a", {"class": "next"})['href']
except Exception as e:
pass
if next_reviews_link:
yield response.follow(next_reviews_link, self.parse_reviews)
It’s a common feature request for Parsel, Scrapy’s library for XML/HTML scraping.
However, you don’t need to wait for such a feature to be implemented. You can fix the HTML code using BeautifulSoup, and use Parsel on the fixed HTML:
from bs4 import BeautifulSoup
# …
response = response.replace(body=str(BeautifulSoup(response.body, "html5lib")))
You can get a charset error using the #Gallaecio's answer, if the original page was not utf-8 encoded, because the response has set to other encoding.
So, you must first switch the encoding.
In addition, there may be a problem of character escaping.
For example, if the character < is encountered in the text of html, then it must be escaped as <. Otherwise, "lxml" will delete it and the text near it, considering it an erroneous html tag.
"html5lib" escapes characters, but is slow.
response = response.replace(encoding='utf-8',
body=str(BeautifulSoup(response.body, 'html5lib')))
"html.parser" is faster, but from_encoding must also be specified (to example 'cp1251').
response = response.replace(encoding='utf-8',
body=str(BeautifulSoup(response.body, 'html.parser', from_encoding='cp1251')))

Downloaded images from the Metropolitan Museum collection are empty

I'm trying to download random public domain images from the Metropolitan Museum collection using their API (more info here : https://metmuseum.github.io/) and Python, unfortunatly the images I get are empty. Here is a minimal code :
import urllib
from urllib2 import urlopen
import json
from random import randint
url = "https://collectionapi.metmuseum.org/public/collection/v1/objects"
objectID_list = json.loads(urlopen(url).read())['objectIDs']
objectID = objectID_list[randint(0,len(objectID_list)-1)]
url_request = url+"/"+str(objectID)
fetched_data = json.loads(urlopen(url_request).read())
if fetched_data['isPublicDomain']:
name = str(fetched_data['title'])
ID = str(fetched_data['objectID'])
url_image = str(fetched_data['primaryImage'])
urllib.urlretrieve(url_image, 'path/'+name+'_'+ID+'.jpg')
If I print url_image and copy/paste it in a browser I get to the desired image, but the code retrieves an image that weights 1ko and can't be opened.
Any idea what I'm doing wrong ?
Your way of downloading is correct, however, it seems as the domain is validating request headers to prevent scraping (probably unintended as they have an API to pull images).
One way of solving this problem is by changing your headers to something realistic, or utilizing fake_useragent and requests.
import requests
from fake_useragent import UserAgent
def save_image(link, file_path):
ua = UserAgent(verify_ssl=False)
headers = {"User-Agent": ua.random}
r = requests.get(link, stream=True, headers=headers)
if r.status_code == 200:
with open(file_path, 'wb') as f:
f.write(r.content)
else:
raise Exception("Error code {}.".format(r.status_code))

Scrapy works in shell but spider returns empty csv

I am learning Scrapy. Now I just try to scrapy items and when I call spider:
planefinder]# scrapy crawl planefinder -o /User/spider/planefinder/pf.csv -t csv
it shows tech information and no scraped content (Crawled 0 pages .... etc), and it returns an empty csv file.
The problem is when i test xpath in scrapy shell it works:
>>> from scrapy.selector import Selector
>>> sel = Selector(response)
>>> flights = sel.xpath("//div[#class='col-md-12'][1]/div/div/table//tr")
>>> items = []
>>> for flt in flights:
... item = flt.xpath("td[1]/a/#href").extract_first()
... items.append(item)
...
>>> items
The following is my planeFinder.py code:
# -*-:coding:utf-8 -*-
from scrapy.spiders import CrawlSpider
from scrapy.selector import Selector, HtmlXPathSelector
from planefinder.items import arr_flt_Item, dep_flt_Item
class planefinder(CrawlSpider):
name = 'planefinder'
host = 'https://planefinder.net'
start_url = ['https://planefinder.net/data/airport/PEK/']
def parse(self, response):
arr_flights = response.xpath("//div[#class='col-md-12'][1]/div/div/table//tr")
dep_flights = response.xpath("//div[#class='col-md-12'][2]/div/div/table//tr")
for flight in arr_flights:
arr_item = arr_flt_Item()
arr_flt_url = flight.xpath('td[1]/a/#href').extract_first()
arr_item['arr_flt_No'] = flight.xpath('td[1]/a/text()').extract_first()
arr_item['STA'] = flight.xpath('td[2]/text()').extract_first()
arr_item['From'] = flight.xpath('td[3]/a/text()').extract_first()
arr_item['ETA'] = flight.xpath('td[4]/text()').extract_first()
yield arr_item
Please before going to CrawlSpider please check the docs for Spiders, some of the issues I've found were:
Instead of host use allowed_domains
Instead of start_url use start_urls
It seem that the page needs to have some cookies set or maybe it's using some kind of basic anti-bot protection, and you need to land somewhere else first.
Try this (I've also changed a bit :
# -*-:coding:utf-8 -*-
from scrapy import Field, Item, Request
from scrapy.spiders import CrawlSpider, Spider
class ArrivalFlightItem(Item):
arr_flt_no = Field()
arr_sta = Field()
arr_from = Field()
arr_eta = Field()
class PlaneFinder(Spider):
name = 'planefinder'
allowed_domains = ['planefinder.net']
start_urls = ['https://planefinder.net/data/airports']
def parse(self, response):
yield Request('https://planefinder.net/data/airport/PEK', callback=self.parse_flight)
def parse_flight(self, response):
flights_xpath = ('//*[contains(#class, "departure-board") and '
'./preceding-sibling::h2[contains(., "Arrivals")]]'
'//tr[not(./th) and not(./td[#class="spacer"])]')
for flight in response.xpath(flights_xpath):
arrival = ArrivalFlightItem()
arr_flt_url = flight.xpath('td[1]/a/#href').extract_first()
arrival['arr_flt_no'] = flight.xpath('td[1]/a/text()').extract_first()
arrival['arr_sta'] = flight.xpath('td[2]/text()').extract_first()
arrival['arr_from'] = flight.xpath('td[3]/a/text()').extract_first()
arrival['arr_eta'] = flight.xpath('td[4]/text()').extract_first()
yield arrival
The problem here is not understanding correctly which "Spider" to use, as Scrapy offers different custom ones.
The main one, and the one you should be using is the simple Spider and not CrawlSpider, because CrawlSpider is used for a more deep and intensive search into forums, blogs, etc.
Just change the type of spider to:
from scrapy import Spider
class plane finder(Spider):
...
Check the value of ROBOTSTXT_OBEY in your settings.py file. By default it's set to True (but not when you run shell). Set it to False if you wan't to disobey robots.txt file.

Not able to scrape more then 10 records using scrapy

I'm new to scrapy and python. I'm using scrapy for scraping the data.
The site using AJAX for pagination so I'm not able to get the data more than 10 records I'm posting my code
from scrapy import Spider
from scrapy.selector import Selector
from scrapy import Request
from justdial.items import JustdialItem
import csv
from itertools import izip
import scrapy
import re
class JustdialSpider(Spider):
name = "JustdialSpider"
allowed_domains = ["justdial.com"]
start_urls = [
"http://www.justdial.com/Mumbai/Dentists/ct-385543",
]
def start_requests(self):
headers = {'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64; rv:48.0) Gecko/20100101 Firefox/48.0'}
for url in self.start_urls:
yield Request(url, headers=headers)
def parse(self, response):
questions = Selector(response).xpath('//div[#class="col-sm-5 col-xs-8 store-details sp-detail paddingR0"]')
for question in questions:
item = JustdialItem()
item['name'] = question.xpath(
'//div[#class="col-sm-5 col-xs-8 store-details sp-detail paddingR0"]/h4/span/a/text()').extract()
item['contact'] = question.xpath(
'//div[#class="col-sm-5 col-xs-8 store-details sp-detail paddingR0"]/p[#class="contact-info"]/span/a/b/text()').extract()
with open('some.csv', 'wb') as f:
writer = csv.writer(f)
writer.writerows(izip(item['name'], item['contact']))
f.close()
return item
# if running code above this I'm able to get 10 records of the page
# This code not working for getting data more than 10 records, Pagination using AJAX
url = 'http://www.justdial.com/functions/ajxsearch.php?national_search=0&act=pagination&city=Mumbai&search=Chemical+Dealers&where=&catid=944&psearch=&prid=&page=2&SID=&mntypgrp=0&toknbkt=&bookDate='
next_page = int(re.findall('page=(\d+)', url)[0]) + 1
next_url = re.sub('page=\d+', 'page={}'.format(next_page), url)
print next_url
def parse_ajaxurl(self, response):
# e.g. http://www.justdial.com/Mumbai/Dentists/ct-385543
my_headers = {'Referer': response.url}
yield Request("ajax_request_url",
headers=my_headers,
callback=self.parse_ajax)
Please help me
Thanks.
Actually if you disable javascript when viewing the page you'll notice that site offers traditional pagination instead of "never ending" AJAX one.
Using this you can simply find url of next page and continue:
def parse(self, response):
questions = response.xpath('//div[contains(#class,"store-details")]')
for question in questions:
item = dict()
item['name'] = question.xpath("h4/span/a/text()").extract_first()
item['contact'] = question.xpath("p[#class='contact-info']//b/text()").extract_first()
yield item
# next page
next_page = response.xpath("//a[#rel='next']/#href").extract_first()
if next_page:
yield Request(next_page)
I also fixed up your xpaths but in overal the only bit that changed is those 3 lines under # next page comment.
As a side note I've noticed you are saving to csv in spider where you can use built-in scrapy exporter command like:
scrapy crawl myspider --output results.csv

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