TypeError:__ init __()为参数'fieldnames'获取了多个值

时间:2018-05-08 18:49:18

标签: python csv web-scraping

我已经在网站上进行了网络练习,我正在尝试将数据放入可以导出到csv的pandas数据框中,当我到达TypeError: __init__() got multiple values for argument 'fieldnames'时出现的点。我想使用csv模块编写文件。有人可以解释错误是如何发生的以及如何解决它?我的代码如下:

from urllib.request import urlopen as uReq
from bs4 import BeautifulSoup as soup
import csv

my_url = 'https://www.allagents.co.uk/find-agent/london/'

uClient = uReq(my_url)

page_html = uClient.read()

uClient.close()

page_soup = soup(page_html, 'html.parser')

containers = page_soup.findAll('div', {'class':'itemlabel3'})

filename = "webscrape.csv" 
records = []

for container in containers:
    comp_name   = container.find('div', {'class':'labelleft2 col-md-10'}).div.h4.a.text

    address=container.find('div', {'class':'labelleft2 col-md-10'}).div.p.text.replace('\n','')

    tel         = container.find('div', {'class':'labelleft2 col-md-10'}).div.find('p', {'style':'clear: both; margin-bottom: 15px;'}).strong.text

    records.append({'company': comp_name, 'address': address, 'telephone': tel})
writer = csv.DictWriter(filename, "w", fieldnames=['company', 'address', 'telephone'])

writer.writeheader()

for r in records:
    writer.writerow(r)

出现错误:

writer = csv.DictWriter(filename, "w", fieldnames=['company', 'address', 'telephone'])

在此先感谢,感谢任何帮助。

2 个答案:

答案 0 :(得分:2)

csv.DictWriter中,前两个参数是文件对象(不是文件名),然后是fieldnames(您指定为"w")。试试这个:

with open(filename, 'w') as f:
    writer = csv.DictWriter(f, ['company', 'address', 'telephone'])
    # write stuff in this block

答案 1 :(得分:1)

我怀疑您对DictWriter的来电有太多参数:

writer = csv.DictWriter(filename, "w", fieldnames ...
                                   ^
                           what is this?

我认为它应该是:

f = open(filename, 'w')
writer = csv.DictWriter(f, fieldnames ...

在您的通话中,fieldnames参数已分配"w",但您也提供自己的版本作为列表。