下面是一个scraper，它遍历两个网站，获取团队的花名册信息，将信息放入一个数组中，然后将数组导出到CSV文件中。一切都很好，但唯一的问题是每次scraper移动到第二个网站时，csv文件中的writerow头会重复出现。当scraper在多个网站中循环时，是否可以调整代码的CSV部分，使标题只出现一次？提前谢谢！在import requests

import csv

from bs4 import BeautifulSoup

team_list={'yankees','redsox'}

for team in team_list:

page = requests.get('http://m.{}.mlb.com/roster/'.format(team))

soup = BeautifulSoup(page.text, 'html.parser')

soup.find(class_='nav-tabset-container').decompose()

soup.find(class_='column secondary span-5 right').decompose()

roster = soup.find(class_='layout layout-roster')

names = [n.contents[0] for n in roster.find_all('a')]

ids = [n['href'].split('/')[2] for n in roster.find_all('a')]

number = [n.contents[0] for n in roster.find_all('td', index='0')]

handedness = [n.contents[0] for n in roster.find_all('td', index='3')]

height = [n.contents[0] for n in roster.find_all('td', index='4')]

weight = [n.contents[0] for n in roster.find_all('td', index='5')]

DOB = [n.contents[0] for n in roster.find_all('td', index='6')]

team = [soup.find('meta',property='og:site_name')['content']] * len(names)

with open('MLB_Active_Roster.csv', 'a', newline='') as fp:

f = csv.writer(fp)

f.writerow(['Name','ID','Number','Hand','Height','Weight','DOB','Team'])

f.writerows(zip(names, ids, number, handedness, height, weight, DOB, team))