pandas 怎么用 selenium 从网页上刮表无头？

nkoocmlb 于 2023-08-01 发布在其他

关注(0)|答案(2)|浏览(97)

我试图用Python编写一个脚本，将Product Attributes表导出为Excel文件（或CSV）从下面的URL。
我写了一个脚本，尝试了一个不同的类名，但我遇到了一个错误！
网址：https://www.digikey.com/en/products/detail/texas-instruments/uln2003aidre4/1912622
我不知道这个消息的原因是什么，因为我可以从不同的网站导出表，但我的代码在这个网站崩溃。（还有Mouser.com）
我有一个理论，我认为这两个网站正在阻止我的脚本，以避免导出他们的数据，但我不确定。

我要导出的表及其检验 * x1c 0d1x

下面是我的代码：

import time
import requests
from selenium import webdriver
from selenium.webdriver.chrome.options import Options
import pandas as pd

def get_specifications_table(url):
    options = Options()
    options.add_argument('--headless')  # Run the browser in headless mode (no visible window)

    driver = webdriver.Chrome(options=options)

    driver.get(url)
    time.sleep(5)  # Add a delay to allow the webpage to load (adjust the time as needed)

    try:
        # Find the element with the specified class name "MuiTable-root css-u6unfi" and extract the table
        class_name = "MuiTable-root.css-u6unfi"
        table_element = driver.find_element("css selector", f".{class_name}")
        table_html = table_element.get_attribute('outerHTML')
        df = pd.read_html(table_html)[0]
        return df
    except Exception as e:
        print("Error:", e)
    finally:
        driver.quit()

    return None

def export_to_excel(df, output_file):
    writer = pd.ExcelWriter(output_file, engine='xlsxwriter')
    df.to_excel(writer, index=False)
    writer.save()
    writer.close()

if __name__ == '__main__':
    url = "https://www.digikey.com/en/products/detail/texas-instruments/uln2003aidre4/1912622"
    output_excel_file = "Specifications_Table_Digikey.xlsx"

    print("Fetching the webpage and extracting the table...")
    specifications_df = get_specifications_table(url)
    
    if specifications_df is not None:
        print("Exporting the table to Excel...")
        export_to_excel(specifications_df, output_excel_file)
        print(f"Table 'Specifications' exported to '{output_excel_file}' successfully.")
    else:
        print("Table extraction or export failed.")

字符串
但我面临这个错误：

Fetching the webpage and extracting the table...
Error: Message: no such element: Unable to locate element: {"method":"css selector","selector":".MuiTable-root.css-u6unfi"}
  (Session info: headless chrome=115.0.5790.110); For documentation on this error, please visit: https://www.selenium.dev/documentation/webdriver/troubleshooting/errors#no-such-element-exception
Stacktrace:
Backtrace:
    GetHandleVerifier [0x004BA813+48355]
    (No symbol) [0x0044C4B1]
    (No symbol) [0x00355358]
    (No symbol) [0x003809A5]
    (No symbol) [0x00380B3B]
    (No symbol) [0x003AE232]
    (No symbol) [0x0039A784]
    (No symbol) [0x003AC922]
    (No symbol) [0x0039A536]
    (No symbol) [0x003782DC]
    (No symbol) [0x003793DD]
    GetHandleVerifier [0x0071AABD+2539405]
    GetHandleVerifier [0x0075A78F+2800735]
    GetHandleVerifier [0x0075456C+2775612]
    GetHandleVerifier [0x005451E0+616112]
    (No symbol) [0x00455F8C]
    (No symbol) [0x00452328]
    (No symbol) [0x0045240B]
    (No symbol) [0x00444FF7]
    BaseThreadInitThunk [0x772500C9+25]
    RtlGetAppContainerNamedObjectPath [0x77BC7B4E+286]
    RtlGetAppContainerNamedObjectPath [0x77BC7B1E+238]

Table extraction or export failed.

型

pandas

来源：https://stackoverflow.com/questions/76796862/how-to-scrape-table-from-webpage-with-selenium-headless

2条答案

按热度按时间

siv3szwd1#

1.检查driver.page_source以了解发生了什么：

print(driver.page_source)

字符串
1.根据该信息设置user-agent以避免阻塞：

options = Options()
options.add_argument('--headless')
options.add_argument('user-agent=whatever you like to set')
driver = webdriver.Chrome(options=options)

型
1.在这种情况下，直接通过pandas.read_html()和特定属性选择元素：

pd.read_html(driver.page_source, attrs={'id':'product-attributes'})[0].iloc[:,:2]

型

示例

...
options = Options()
options.add_argument('--headless')
options.add_argument('user-agent=whatever you like to set')
driver = webdriver.Chrome(options=options)

driver.get('https://www.digikey.com/en/products/detail/texas-instruments/uln2003aidre4/1912622')

pd.read_html(driver.page_source, attrs={'id':'product-attributes'})[0].iloc[:,:2]

型

输出

| | Type | Description |
| --|--| ------------ |
| 分类|集成电路（IC）电源管理（PMIC）配电开关、负载驱动器| Integrated Circuits (ICs)Power Management (PMIC)Power Distribution Switches, Load Drivers |
| 制造商|德州仪器| Texas Instruments |
| 系列|ULx200xA| ULx200xA |
| Package |胶带和卷轴（TR）| Tape & Reel (TR) |
| 产品状态|Digi-Key已停产| Discontinued at Digi-Key |
| 开关类型|继电器，电磁阀驱动器| Relay, Solenoid Driver |
| 输出数量|七| 7 |
| 比率-输入：输出|一比一| 1:1 |
| 输出配置|低端| Low Side |
| |||

赞(0）回复(0）举报 2023-08-01

35g0bw712#

要从网站ULN2003AIDRE4 Texas Instruments | Integrated Circuits (ICs) | DigiKey的 * 产品属性 * 表中抓取数据，您需要为<table>元素的visibility_of_element_located()导出WebDriverWait，并使用DataFrame从Pandas，您可以使用以下locator strategy：
代码块：

from selenium import webdriver
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.by import By
from selenium.webdriver.support import expected_conditions as EC
import pandas as pd

options = Options()
options.add_argument('--headless=new')
options.add_argument("start-maximized")
driver = webdriver.Chrome(options=options)
driver.get("https://www.digikey.com/en/products/detail/texas-instruments/uln2003aidre4/1912622")
time.sleep(10)
table_data = WebDriverWait(driver, 20).until(EC.visibility_of_element_located((By.CSS_SELECTOR, "div[data-evg='product-details-product-attributes'] table.MuiTable-root"))).get_attribute("outerHTML")
df = pd.read_html(table_data)
print(df)
driver.quit()

字符串
控制台输出：

[                          Type                                        Description  Select
0                     Category  Integrated Circuits (ICs)Power Management (PMI...     NaN
1                          Mfr                                  Texas Instruments     NaN
2                       Series                                           ULx200xA     NaN
3                      Package                                   Tape & Reel (TR)     NaN
4               Product Status                           Discontinued at Digi-Key     NaN
5                  Switch Type                             Relay, Solenoid Driver     NaN
6            Number of Outputs                                                  7     NaN
7         Ratio - Input:Output                                                1:1     NaN
8         Output Configuration                                           Low Side     NaN
9                  Output Type                                         Darlington     NaN
10                   Interface                                           Parallel     NaN
11              Voltage - Load                                          50V (Max)     NaN
12  Voltage - Supply (Vcc/Vdd)                                       Not Required     NaN
13      Current - Output (Max)                                              500mA     NaN
14                Rds On (Typ)                                                  -     NaN
15                  Input Type                                          Inverting     NaN
16                    Features                                                  -     NaN
17            Fault Protection                                                  -     NaN
18       Operating Temperature                                 -40°C ~ 105°C (TA)     NaN
19               Mounting Type                                      Surface Mount     NaN
20     Supplier Device Package                                            16-SOIC     NaN
21              Package / Case                     16-SOIC (0.154", 3.90mm Width)     NaN
22         Base Product Number                                            ULN2003     NaN]

型

引用

您可以在以下内容中找到一些相关的详细讨论：

赞(0）回复(0）举报 2023-08-01

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pandas 怎么用 selenium 从网页上刮表无头？

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