关于python：为什么在输出到CSV时，为什么要一遍又一遍地写在同一行上？

Why is this writing to the same line over and over when output to a CSV?

我制作了一个网络抓取应用程序，希望将数据放入一个csv文件中。抓取部分工作正常并打印到命令行，但是当我尝试写入csv时，它会一遍又一遍地重写循环数据(有100个)的迭代。我不知道为什么。有什么想法为什么不每次都将结果写到新行中？ (我尝试使用csv.writer和csv.DictWriter方法。结果相同。)

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def create_csv_file():
file_name = str(datetime.date.today())
field_names = ['Rank', 'Title', 'Author', 'Star Rating', 'Price']
with open('{}.csv'.format(file_name), 'w', newline='') as csvfile:
the_writer = csv.DictWriter(csvfile, fieldnames=field_names)
the_writer.writeheader()

return file_name, field_names

def get_book_details(soup, file, headers):
items = soup.find_all('div', class_='zg_itemImmersion')

for i in items:
#Web Scrape code here. Cut to truncate.

with open('{}.csv'.format(file), 'w', newline='', encoding='utf-8') as csvfile:
the_writer = csv.DictWriter(csvfile, fieldnames=headers)
the_writer.writerow({'Rank': rank, 'Title': title, 'Author': author, 'Star Rating': star_rating, 'Price': price})