Question

从列表开始，我想查询网页以从每个列表中提取标签。结果应保存在csv文件中。但是，我遇到此错误：ValueError：dict包含不在字段名中的字段。

我的理解是，尽管字典根据列表的不同而具有可变数量的关键字，但是来自查询的字典包含的关键字比字段名称更多。

代码如下：

import csv
from selenium import webdriver
from time import sleep
from parsel import Selector
from selenium.webdriver.common.keys import Keys
from collections import defaultdict

####### reading from the input file ##########

columns = defaultdict(list)  # each value in each column is appended to a list

# get the list of keywords from the csv file
with open('query.csv', 'r') as csvfile:
reader = csv.DictReader(csvfile)  # read rows into a dictionary format
for row in reader:  # read a row as {column1: value1, column2: value2,...}
    for (k, v) in row.items():  # go over each column name and value
        columns[k].append(v)  # append the value into the appropriate list

# the list containing all of the keywords
search_query_list = columns['Keyword']

########## start scraping ###############

rb_results = []

# create a driver and let it open google chrome
driver = webdriver.Chrome("chromedriver")

# get linkedin website
driver.get('https://www.redbubble.com/')
sleep(0.5)


for i in range(len(search_query_list)):

next_query = search_query_list[i]

# get RB website
driver.get('https://www.redbubble.com/')

# get the search by its id
search_bar = driver.find_element_by_name("query")

sleep(0.5)

# enter the query to the search bar
search_bar.send_keys(next_query)

# press enter
search_bar.send_keys(Keys.RETURN)
sleep(1)


# from parsel's selector get the page source
sel1 = Selector(text=driver.page_source)
sleep(0.5)

# first shirt //
continue_link = driver.find_element_by_class_name('shared-components-ShopSearchSkeleton-ShopSearchSkeleton__composedComponentWrapper--1s_CI').click()
sleep(1)

sel2 = Selector(text=driver.page_source)
sleep(0.5)

################## get TAGS ###############

# Check tags for all products
try:
    # get the tags for the search query   
    tags_rb = driver.find_element_by_class_name("shared-components-Tags-Tags__listContent--oLdDf").extract_first()

       # if number of products is found print it and search for the prime
    # print the number of products found
    if tags_rb == None:
        rb_results.append("0")

    else:

        rb_results = str(tags_rb)

except:
 rb_results.append("error")   

###### writing part ########
with open ("rb_results.csv","w", newline='') as resultFile: 
    writer = csv.DictWriter(resultFile, fieldnames=["Rb Results"],delimiter='\t')
    writer.writeheader()

    writer.writerows({'Rb Tags': item} for item in rb_results)

    resultFile.close()

如何解决以下错误消息：ValueError：dict包含不在字段名“ Rb标签”中的字段？

非常感谢！

ValueError：dict包含不在字段名称中的字段-WebScraping

0 个答案: