CODEWITHSUNDEEP
pythonscrapysplash-screenscrapy-splash
Tim
Tim

Reputation: 201

How to access data from one function in another function

I have a web scraping program and in my spider I need to access to information in my process_csv function but I need to access it from my start_requests function. in my process_csv function I have a variable "ip" which takes ips from a CSV file and adds http:// to the beginning and the port number to the end and the function goes on to pair them with a user agent and URL that needs to be scraped. Anyways I need access to those ips in my start_requests function therefore I need to call the variable "ip" from my start_requests function. How would I do that?

SplashSpider.py

import csv
from scrapy.spiders import Spider
from scrapy_splash import SplashRequest
from ..items import GameItem

# process the csv file so the url + ip address + useragent pairs are the same as defined in the file # returns a list of dictionaries, example:
# [ {'url': 'http://www.starcitygames.com/catalog/category/Rivals%20of%20Ixalan',
#    'ip': 'http://204.152.114.244:8050',
#    'ua': "Mozilla/5.0 (BlackBerry; U; BlackBerry 9320; en-GB) AppleWebKit/534.11"},
#    ...
# ]
def process_csv(csv_file):
    data = []
    reader = csv.reader(csv_file)
    next(reader)
    for fields in reader:
        if fields[0] != "":
            url = fields[0]
        else:
            continue # skip the whole row if the url column is empty
        if fields[1] != "":
            ip = "http://" + fields[1] + ":8050" # adding http and port because this is the needed scheme
        if fields[2] != "":
            useragent = fields[2]
        data.append({"url": url, "ip": ip, "ua": useragent})
    return data


class MySpider(Spider):
    name = 'splash_spider'  # Name of Spider

    # notice that we don't need to define start_urls
    # just make sure to get all the urls you want to scrape inside start_requests function

    # getting all the url + ip address + useragent pairs then request them
    def start_requests(self):

        # get the file path of the csv file that contains the pairs from the settings.py
        with open(self.settings["PROXY_CSV_FILE"], mode="r") as csv_file:
            # requests is a list of dictionaries like this -> {url: str, ua: str, ip: str}
            requests = process_csv(csv_file)

        for req in requests:
            # no need to create custom middlewares
            # just pass useragent using the headers param, and pass proxy using the meta param
            yield SplashRequest(url=req["url"], callback=self.parse, args={"wait": 3},
                                splash_url = ip,
                                headers={"User-Agent": req["ua"]},
                                meta={
                                    "proxy": (req["ip"]),
                                  })

    # Scraping
#    def parse(self, response):
#        item = GameItem()
#        for game in response.css("tr"):
#            # Card Name
#            item["card_name"] = game.css("a.card_popup::text").extract_first()
#            yield item

Upvotes: 0

Views: 501

Answers (1)

Anurag Saxena
Anurag Saxena

Reputation: 468

In your process_csv function, you are appending a list called data with {"url": url, "ip": ip, "ua": useragent}. So you can call each of those records from the function, which will return a dict and then you can call the ip. Example:

request_ip = process_csv(csv_file)[0]["ip"] - will return the ip in the first record in the list. You can run a loop to get all the ip's and store them in a list.

Hope this helps.

Upvotes: 2

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