为什么keyerror报错？(语言-python)

Question

# -*- coding:utf-8 -*-
import requests
import re
import random
import time

# url = 'https://api.m.jd.com/?appid=item-v3&functionId=pc_club_productPageComments&client=pc&clientVersion=1.0.0&t=1687854826527&loginType=3&uuid=122270672.1687854697612690803356.1687854698.1687854698.1687854698.1&productId=100011754309&score=0&sortType=5&page=0&pageSize=10&isShadowSku=0&fold=1&bbtf=&shield='

headers = {"user-agent":"Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36"}

mycomments=[]
for page in range(0,10):
    # url = 'https://api.m.jd.com/?appid=item-v3&functionId=pc_club_productPageComments&client=pc&clientVersion=1.0.0&t=1687854826527&loginType=3&uuid=122270672.1687854697612690803356.1687854698.1687854698.1687854698.1&productId=100011754309&score=0&sortType=5&page=0&pageSize=10&isShadowSku=0&fold=1&bbtf=&shield='+str(page)\
    #         +'&pageSize=10ISsHAD
    #         OWsKU+)&fold=1'
    url = 'https://api.m.jd.com/?appid=item-v3&functionId=pc_club_productPageComments&client=pc&clientVersion=1.0.0&t=1687857924287&loginType=3&uuid=122270672.1687854697612690803356.1687854698.1687854698.1687854698.1&productId=100011754309&score=0&sortType=5&page='+str(page)+'&pageSize=10&isShadowSku=0&rid=0&fold=1&bbtf=&shield='
    response = requests.get(url=url,headers=headers)
    json_data = response.json()
    # print('----------loading'+str(page)+'----page---------')
    comments=json_data['comments']
    for comment in comments:
        # print(comments)
        guid=comment['guid']
        content=comment['content']
        content=re.sub(r'[\t\n]','',content)
        creationTime=comment['creationTime']
        productColor=comment['productColor']
        nickname=comment['nickname']
        score=comment['score']
        userClient=comment['userClient']
        days=comment['days']
        imageCount=comment['imageCount']
        print(guid,content,creationTime,productColor,score,userClient,days,imageCount)
        mycomments.append( str(guid)+'\t' +str(nickname)+'\t' +str(content)+'\t' +str(creationTime)+'\t' +
                           str(productColor)+'\t' +str(score)+'\t' +str(userClient)+'\t' +str(days)+'\t' +str(imageCount))
    time.sleep(random.randint(2,4))
    print(response.json())
print(mycomments)

明明'imageCount'有在最后一列读取出来，但是还是报错keyerror:'imageCount'。除去imageCount这个相关的其他代码都可以正常运行。

Answer 1

该回答引用自GPT-3.5,由博主GISer Liu编写：

在你的代码中，报错是因为有些评论中没有imageCount这个键，导致comment['imageCount']访问时报错KeyError。为了解决这个问题，你可以在访问comment['imageCount']前先检查该键是否存在，如果不存在则设置一个默认值，如0。这样可以避免因为缺少imageCount键而导致的错误。
修改后的代码如下所示：
pythonCopy code

import requests
import re
import random
import time
headers = {
"user-agent": "Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Safari/537.36"
}
mycomments = []
for page in range(0, 10):
url = 'https://api.m.jd.com/?appid=item-v3&functionId=pc_club_productPageComments&client=pc&clientVersion=1.0.0&t=1687857924287&loginType=3&uuid=122270672.1687854697612690803356.1687854698.1687854698.1687854698.1&productId=100011754309&score=0&sortType=5&page='+str(page)+'&pageSize=10&isShadowSku=0&rid=0&fold=1&bbtf=&shield='
response = requests.get(url=url, headers=headers)
json_data = response.json()
comments = json_data.get('comments', [])  # 获取评论列表，如果没有评论，则返回空列表
for comment in comments:
guid = comment['guid']
content = re.sub(r'[\t\n]', '', comment['content'])
creationTime = comment['creationTime']
productColor = comment['productColor']
nickname = comment['nickname']
score = comment['score']
userClient = comment['userClient']
days = comment['days']
imageCount = comment.get('imageCount', 0)  # 获取评论图片数量，如果没有则默认为0
print(guid, nickname, content, creationTime, productColor, score, userClient, days, imageCount)
mycomments.append(f"{guid}\t{nickname}\t{content}\t{creationTime}\t{productColor}\t{score}\t{userClient}\t{days}\t{imageCount}")
time.sleep(random.randint(2, 4))
print(response.json())
print(mycomments)

这样修改后，即使某些评论没有imageCount这个键，代码也不会报错了。

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