parser

import requests
import xml.etree.ElementTree as ET
import os

file_path = "test.csv"

def getData(url):
    UserAgent = 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.186 YaBrowser/18.3.1.1232 Yowser/2.5 Safari/537.36'

    result = requests.get(url, headers={'User-Agent': UserAgent})
    return result


def writeData(item):
    with open(file_path, "a", encoding='utf-8') as file:
        print("new line - " + item.find('title').text + "|" + item.find('pubDate').text)
        file.write(item.find('title').text + "|" + item.find('link').text + "|" + 
            item.find('description').text.replace("\n", "") + "|" + item.find('pubDate').text + "\n")

if __name__ == '__main__':
    if not os.path.exists(file_path):
        open(file_path, 'tw', encoding='utf-8')

    url = 'http://zakupki.gov.ru/epz/order/smp/rss'
    result = getData(url)
        
    root = ET.fromstring(result.text)   
    lines = root.findall('.//item')

    text = open(file_path, "r", encoding='utf-8').read()
    for item in lines:
        if item.find('title').text not in text:
            writeData(item)