Лишние пустые строки при записи в csv файл

Код:

import csv
import requests
from bs4 import BeautifulSoup


def get_resp(url):
    resp = requests.get(url)
    return resp.text


def write_csv(data):
    with open('proxy.csv', 'a') as f:
        writer = csv.writer(f)
        
        writer.writerow([
                data['ip'],
                data['port']
            ])


def get_page(html):
    sp = BeautifulSoup(html, 'lxml')

    trs = sp.find('table', id='proxylisttable').find('tbody').find_all('tr')[:3]
    for tr in trs:
        tds = tr.find_all('td')
        ip = tds[0].text
        port = tds[1].text
        data = {'ip': ip,'port': port}
        write_csv(data)

Пропускает строку после итерации: