MYSQL python列表索引超出范围

我正在编写一个网络抓取程序，从truecar.com收集数据 我的数据库有3列 当我运行程序时，我得到一个错误，它是这样的：list indext超出范围 以下是我迄今为止所做的工作：

import mysql.connector
from bs4 import BeautifulSoup
import requests
import re

# take the car's name
requested_car_name = input()

# inject the car's name into the URL

my_request = requests.get('https://www.truecar.com/used-cars-for-sale/listings/' +
                          requested_car_name + '/location-holtsville-ny/?sort[]=best_match')


my_soup = BeautifulSoup(my_request.text, 'html.parser')

# ************ car_model column in database ******************
car_model = my_soup.find_all(
    'span', attrs={'class': 'vehicle-header-make-model text-truncate'})

# we have a list of car models
car_list = []
for item in range(20):
    # appends car_model to car_list
    car_list.append(car_model[item].text)

car_string = ', '.join('?' * len(car_list))


# ************** price column in database *****************************
price = my_soup.find_all(
    'div', attrs={'data-test': 'vehicleCardPricingBlockPrice'})
price_list = []
for item in range(20):
    # appends price to price_list
    price_list.append(price[item].text)

price_string = ', '.join('?' * len(price_list))


# ************** distance column in database ***************************
distance = my_soup.find_all('div', attrs={'data-test': 'vehicleMileage'})
distance_list = []
for item in range(20):
    # appends distance to distance_list
    distance_list.append(distance[item].text)

distance_string = ', '.join('?' * len(distance_list))

# check the connection
print('CONNECTING ...')

mydb = mysql.connector.connect(
    host="xxxxx",
    user="xxxxxx",
    password="xxxxxx",
    port='xxxxxx',
    database='xxxxxx'
)

print('CONNECTED')

# checking the connection is done

my_cursor = mydb.cursor(buffered=True)
insert_command = 'INSERT INTO car_name (car_model, price, distance) VALUES (%s, %s, %s);' % (car_string, price_string, distance_string)
# values = (car_string, price_string, distance_string)
my_cursor.execute(insert_command, car_list, price_list, distance_list)
mydb.commit()

print(my_cursor.rowcount, "Record Inserted")

mydb.close()

我还有一个问题，我不能在我的列中插入列表，我尝试了很多方法，但不幸的是，我没能让它工作

我认为问题出在这方面：

IndexError                                Traceback (most recent call last)
<ipython-input-1-4a3930bf0f57> in <module>
     23 for item in range(20):
     24     # appends car_model to car_list
---> 25     car_list.append(car_model[item].text)
     26 
     27 car_string = ', '.join('?' * len(car_list))

IndexError: list index out of range

索引器错误回溯（最近一次调用）
在里面
23对于范围内的项目（20）：
24#将汽车模型附加到汽车列表
--->25车辆列表。追加（车辆模型[项目]。文本）
26
27 car_string='，join（'？'*len（car_列表））
索引器：列表索引超出范围

---

我不希望它将整个列表插入数据库中的一行。我想在我的数据库中找到truecar.com中的前20辆车的价格、型号、里程数

问题似乎是车型列表中的条目不到20个

for item in range(20):
  car_list.append(car_model[item].text)

这总是试图将20个项目添加到汽车列表中。如果少于20个条目，则会出现错误，因为汽车模型[20]。只有10个条目时，文本不存在。你可以试试

for item in range(len(car_model)):
  car_list.append(car_model[item].text)

---

你在硬编码长度。更改对soup元素进行迭代的方式。因此：

import mysql.connector
from bs4 import BeautifulSoup
import requests


# take the car's name
requested_car_name = input('Enter car name: ')

# inject the car's name into the URL

my_request = requests.get('https://www.truecar.com/used-cars-for-sale/listings/' +
                          requested_car_name + '/location-holtsville-ny/?sort[]=best_match')


my_soup = BeautifulSoup(my_request.text, 'html.parser')

# ************ car_model column in database ******************
car_model = my_soup.find_all(
    'span', attrs={'class': 'vehicle-header-make-model text-truncate'})

# we have a list of car models
car_list = []
for item in car_model:
    # appends car_model to car_list
    car_list.append(item.text)




# ************** price column in database *****************************
price = my_soup.find_all(
    'div', attrs={'data-test': 'vehicleCardPricingBlockPrice'})
price_list = []
for item in price:
    # appends price to price_list
    price_list.append(item.text)




# ************** distance column in database ***************************
distance = my_soup.find_all('div', attrs={'data-test': 'vehicleMileage'})
distance_list = []
for item in distance:
    # appends distance to distance_list
    distance_list.append(item.text)




# check the connection
print('CONNECTING ...')

mydb = mysql.connector.connect(
    host="xxxxx",
    user="xxxxxx",
    password="xxxxxx",
    port='xxxxxx',
    database='xxxxxx'
)

print('CONNECTED')

# checking the connection is done

my_cursor = mydb.cursor(buffered=True)
insert_command = 'INSERT INTO car_name (car_model, price, distance) VALUES (%s, %s, %s)'
values = list(zip(car_list, price_list, distance_list))
my_cursor.executemany(insert_command, values)
mydb.commit()

print(my_cursor.rowcount, "Record Inserted")

mydb.close()

备选方案：

还有API，您可以在其中获取dat：

import mysql.connector
import requests
import math


# take the car's name
requested_car_name = input('Enter car name: ')

# inject the car's name into the URL

url = 'https://www.truecar.com/abp/api/vehicles/used/listings'
payload = {
'city': 'holtsville',
'collapse': 'true',
'fallback': 'true',
'include_incentives': 'true',
'include_targeted_incentives': 'true',
'make_slug': requested_car_name,
'new_or_used': 'u',
'per_page': '30',
'postal_code': '',
'search_event': 'true',
'sort[]': 'best_match',
'sponsored': 'true',
'state': 'ny',
'page':'1'}


jsonData = requests.get(url, params=payload).json()
total = jsonData['total']
total_pages = math.ceil(total/30)

total_pages_input = input('There are %s pages to iterate.\nEnter the number of pages to go through or type ALL: ' %total_pages)
if total_pages_input.upper() == 'ALL':
    total_pages = total_pages
else:
    total_pages = int(total_pages_input)

values = []
for page in range(1,total_pages+1):
    if page == 1:
        car_listings = jsonData['listings']
    else:
        payload.update({'page':'%s' %page})
        jsonData = requests.get(url, params=payload).json()
        car_listings = jsonData['listings']
        
    for listing in car_listings:
        vehicle = listing['vehicle']
        
        ex_color = vehicle['exterior_color']
        in_color = vehicle['interior_color']
        location = vehicle['location']
        price = vehicle['list_price']
        make = vehicle['make']
        model = vehicle['model']
        mileage = vehicle['mileage']
        style = vehicle['style']
        year = vehicle['year']
        
        engine = vehicle['engine']
        accidentCount = vehicle['condition_history']['accidentCount']
        ownerCount = vehicle['condition_history']['ownerCount']
        isCleanTitle = vehicle['condition_history']['titleInfo']['isCleanTitle']
        isFrameDamaged = vehicle['condition_history']['titleInfo']['isFrameDamaged']
        isLemon = vehicle['condition_history']['titleInfo']['isLemon']
        isSalvage = vehicle['condition_history']['titleInfo']['isSalvage']
        isTheftRecovered = vehicle['condition_history']['titleInfo']['isTheftRecovered']
        
        values.append((ex_color, in_color,location,price,make,model,mileage,
        style,year,engine,accidentCount,ownerCount,isCleanTitle,isFrameDamaged,
        isLemon, isSalvage,isTheftRecovered))
    print('Completed: Page %s of %s' %(page,total_pages))
        
        
# check the connection
print('CONNECTING ...')

mydb = mysql.connector.connect(
    host="xxxxx",
    user="xxxxxx",
    password="xxxxxx",
    port='xxxxxx',
    database='xxxxxx'
)

print('CONNECTED')

# checking the connection is done

my_cursor = mydb.cursor(buffered=True)

# create_command = ''' create table car_information (exterior_color varchar(255), interior_color varchar(255),location varchar(255),price varchar(255),make varchar(255),model varchar(255),mileage varchar(255),
#         style varchar(255),year varchar(255),engine varchar(255),accidentCount varchar(255),ownerCount varchar(255),isCleanTitle varchar(255),isFrameDamaged varchar(255),
#         isLemon varchar(255), isSalvage varchar(255),isTheftRecovered varchar(255))'''

# my_cursor.execute(create_command)
# print('created')


insert_command = '''INSERT INTO car_name (exterior_color, interior_color,location,price,make,model,mileage,
        style,year,engine,accidentCount,ownerCount,isCleanTitle,isFrameDamaged,
        isLemon, isSalvage,isTheftRecovered) VALUES (%s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s, %s)'''
my_cursor.executemany(insert_command, values)
mydb.commit()

print(my_cursor.rowcount, "Record Inserted")

mydb.close()             

---

你能通过完整的跟踪来显示到底是哪一行导致了问题吗？伙计，你能给我们回溯一下吗？很抱歉，我在internetchange中将第25行更改为范围内的项目（len（car_model））：你不能硬编码为20将第25行更改为什么？我在您的更改中遇到了这个错误：ResultSet对象没有属性“text”。您可能将元素列表视为单个元素。当您打算调用find（）时，是否调用了find_all（）？对不起。有个打字错误。修复了上面的问题它在数据库中给了我一个问号，与Raphael Eckert的答案相同。您将字符串与

car_string='，'。连接（'？'*len（car_list））

我在数据库第1行的'car_model'列中编辑了太长的解决方案数据，所有的问号都是这样的=>5？，从模型开始，你可以将它从右方拖动到右方，为了看看到底是什么吸引了我？我进入宝马，它给了我一条插入的记录，在数据库中我有这样的信息：'6'，'？，我不希望它将整个列表插入数据库中的一行。我想要truecar.com中的前20辆车的价格、型号、里程数在我的数据库中“你能在从数据库中提取后立即打印（汽车模型）以查看实际提取的内容吗？”你还能这样做吗。我说的不是插入，我说的是在追加之前这个安全变量的格式和内容。