本文介绍了Web爬网提取Javascript表Selenium + Python的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我已经阅读了几篇有关Web Scraping的文章，但我并不理解如何在网站中查找元素.
I've read several articles of Web Scraping with but I didn't undestand how to find the elements in the site.
我要删除表格的网站如下: http://www .bmfbovespa.com.br/pt_br/servicos/market-data/cotacoes/mercado-de-derivativos/?symbol = DI1
The site I want to scrap the table is below:http://www.bmfbovespa.com.br/pt_br/servicos/market-data/cotacoes/mercado-de-derivativos/?symbol=DI1
我要删除表格:"TB01，"TB02，TB03和TB04"是表格的ID
I want to scrap the tables: "TB01, "TB02, TB03 and TB04" theses are the ids of the tables
<tbody> == $0
<tr>
<td id="TB01">...</td>
<td id="TB02">...</td>
<td id="TB03">...</td>
<td id="TB04">...</td>
<tr>
我已经尝试了Selenium库的所有find.element函数，但没有一个起作用.
I've tried all the find.element functions of the Selenium libraries but none of then works.
该站点还需要等待一些负载，我已经习惯了功能WebDriverWait，但是应该将它与表的存在联系起来，如果find_element无法正常工作，可能WebDriverWait猜.
Also the site has some load to wait, I've used to the function WebDriverWait but it should be tie with the presence of the table, if the find_element didn't work probably the WebDriverWait neither I guess.
推荐答案
如果您分析网站，并且该网站通过chrome开发人员工具在后端运行，则非常简单.
It's very simple if you analyze the website and it's working in the backend via chrome developer tools.
在开始抓取之前，您需要了解Web中的Ajax请求.大多数网站都使用ajax请求，因此，所有内容都是动态加载的.
Before diving into scraping you need to know about ajax requests in the web. Most websites use ajax requests, therefore, everything is loaded dynamically.
要遵循的步骤:
- 在Chrome的新标签页中打开网站
- 打开Chrome开发者控制台
- 转到网络"选项卡并刷新页面.您可以看到网站正在动态加载呼叫.
对于网站- http://www.bmfbovespa.com.br/pt_br/servicos/market-data/cotacoes/mercado-de-derivativos/?symbol=DI1 ，这是图片.
For the website - http://www.bmfbovespa.com.br/pt_br/servicos/market-data/cotacoes/mercado-de-derivativos/?symbol=DI1 ,here's the image.
您可以看到正在调用DL1 API.转到标题并查看网址.现在您知道了URL.因此，使用python获取数据非常容易.这是代码.
You can see the DL1 API being called. Go to the headers and see the url.Now you get to know the url. Therefore, it's very easy to get the data using python. Here's the code.
import requests, json
text = reuqests.get("http://cotacao.b3.com.br/mds/api/v1/DerivativeQuotation/DI1").text
data = json.loads(text)
print(data['Scty'])
以上程序的输出如下
[{'SctyQtn': {'avrgPric': 7.7862,
'bottomLmtPric': 7.01,
'curPrc': 7.78,
'maxPric': 7.79,
'minPric': 7.74,
'opngPric': 7.74,
'prvsDayAdjstmntPric': 7.684,
'topLmtPric': 8.525},
'asset': {'AsstSummry': {'grssAmt': 111008714.5,
'mtrtyCode': '2019-06-03',
'opnCtrcts': 36655,
'tradQty': 141,
'traddCtrctsQty': 1175},
'code': 'DI1'},
'buyOffer': {'price': 7.64},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 7.675},
'symb': 'DI1M19'},
{'SctyQtn': {'avrgPric': 8.1758,
'bottomLmtPric': 7.49,
'curPrc': 8.19,
'maxPric': 8.3,
'minPric': 8.13,
'opngPric': 8.21,
'prvsDayAdjstmntPric': 8.237,
'topLmtPric': 9.2},
'asset': {'AsstSummry': {'grssAmt': 417475320.0,
'mtrtyCode': '2019-10-01',
'opnCtrcts': 769684,
'tradQty': 167,
'traddCtrctsQty': 4550},
'code': 'DI1'},
'buyOffer': {'price': 8.16},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 8.19},
'symb': 'DI1V19'},
{'SctyQtn': {'avrgPric': 6.6549,
'bottomLmtPric': 6.125,
'curPrc': 6.7,
'maxPric': 6.71,
'minPric': 6.645,
'opngPric': 6.68,
'prvsDayAdjstmntPric': 6.669,
'topLmtPric': 7.235},
'asset': {'AsstSummry': {'grssAmt': 245262515.35,
'mtrtyCode': '2018-12-03',
'opnCtrcts': 193484,
'tradQty': 26,
'traddCtrctsQty': 2495},
'code': 'DI1'},
'buyOffer': {'price': 6.68},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 6.695},
'symb': 'DI1Z18'},
{'SctyQtn': {'avrgPric': 12.4511,
'bottomLmtPric': 11.58,
'curPrc': 12.4,
'maxPric': 12.63,
'minPric': 12.39,
'opngPric': 12.45,
'prvsDayAdjstmntPric': 12.533,
'topLmtPric': 13.78},
'asset': {'AsstSummry': {'grssAmt': 995856709.26,
'mtrtyCode': '2027-01-04',
'opnCtrcts': 339175,
'tradQty': 2616,
'traddCtrctsQty': 26466},
'code': 'DI1'},
'buyOffer': {'price': 12.39},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 12.4},
'symb': 'DI1F27'},
{'SctyQtn': {'avrgPric': 10.542,
'bottomLmtPric': 9.61,
'curPrc': 10.6,
'maxPric': 10.6,
'minPric': 10.4,
'opngPric': 10.43,
'prvsDayAdjstmntPric': 10.525,
'topLmtPric': 11.71},
'asset': {'AsstSummry': {'grssAmt': 3667893.9,
'mtrtyCode': '2021-10-01',
'opnCtrcts': 25005,
'tradQty': 10,
'traddCtrctsQty': 50},
'code': 'DI1'},
'buyOffer': {'price': 10.42},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 10.44},
'symb': 'DI1V21'},
{'SctyQtn': {'bottomLmtPric': 11.5,
'prvsDayAdjstmntPric': 12.445,
'topLmtPric': 13.69},
'asset': {'AsstSummry': {'mtrtyCode': '2026-07-01', 'opnCtrcts': 3325},
'code': 'DI1'},
'mkt': {'cd': 'FUT'},
'symb': 'DI1N26'},
{'SctyQtn': {'avrgPric': 8.8308,
'bottomLmtPric': 8.08,
'curPrc': 8.83,
'maxPric': 9,
'minPric': 8.78,
'opngPric': 8.86,
'prvsDayAdjstmntPric': 8.886,
'topLmtPric': 9.94},
'asset': {'AsstSummry': {'grssAmt': 355167456.9,
'mtrtyCode': '2020-04-01',
'opnCtrcts': 647478,
'tradQty': 269,
'traddCtrctsQty': 4065},
'code': 'DI1'},
'buyOffer': {'price': 8.82},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 8.83},
'symb': 'DI1J20'},
{'SctyQtn': {'avrgPric': 7.6,
'bottomLmtPric': 6.86,
'curPrc': 7.6,
'maxPric': 7.6,
'minPric': 7.6,
'opngPric': 7.6,
'prvsDayAdjstmntPric': 7.515,
'topLmtPric': 8.325},
'asset': {'AsstSummry': {'grssAmt': 476031.4,
'mtrtyCode': '2019-05-02',
'opnCtrcts': 47300,
'tradQty': 1,
'traddCtrctsQty': 5},
'code': 'DI1'},
'buyOffer': {'price': 7.46},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 7.5},
'symb': 'DI1K19'},
{'SctyQtn': {'avrgPric': 10.6572,
'bottomLmtPric': 9.77,
'curPrc': 10.62,
'maxPric': 10.81,
'minPric': 10.57,
'opngPric': 10.6,
'prvsDayAdjstmntPric': 10.695,
'topLmtPric': 11.88},
'asset': {'AsstSummry': {'grssAmt': 2389488485.5,
'mtrtyCode': '2022-01-03',
'opnCtrcts': 744332,
'tradQty': 3539,
'traddCtrctsQty': 33516},
'code': 'DI1'},
'buyOffer': {'price': 10.61},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 10.63},
'symb': 'DI1F22'},
{'SctyQtn': {'avrgPric': 6.8224,
'bottomLmtPric': 6.26,
'curPrc': 6.83,
'maxPric': 6.88,
'minPric': 6.78,
'opngPric': 6.8,
'prvsDayAdjstmntPric': 6.835,
'topLmtPric': 7.47},
'asset': {'AsstSummry': {'grssAmt': 3759849797.05,
'mtrtyCode': '2019-01-02',
'opnCtrcts': 3296622,
'tradQty': 1187,
'traddCtrctsQty': 38465},
'code': 'DI1'},
'buyOffer': {'price': 6.825},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 6.835},
'symb': 'DI1F19'},
{'SctyQtn': {'avrgPric': 12.6441,
'bottomLmtPric': 11.8,
'curPrc': 12.6,
'maxPric': 12.84,
'minPric': 12.6,
'opngPric': 12.67,
'prvsDayAdjstmntPric': 12.753,
'topLmtPric': 14},
'asset': {'AsstSummry': {'grssAmt': 305050246.35,
'mtrtyCode': '2029-01-02',
'opnCtrcts': 87547,
'tradQty': 807,
'traddCtrctsQty': 10415},
'code': 'DI1'},
'buyOffer': {'price': 12.59},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 12.6},
'symb': 'DI1F29'},
{'SctyQtn': {'avrgPric': 7.185,
'bottomLmtPric': 6.57,
'curPrc': 7.185,
'maxPric': 7.185,
'minPric': 7.185,
'opngPric': 7.185,
'prvsDayAdjstmntPric': 7.196,
'topLmtPric': 7.93},
'asset': {'AsstSummry': {'grssAmt': 965104.3,
'mtrtyCode': '2019-03-01',
'opnCtrcts': 42941,
'tradQty': 1,
'traddCtrctsQty': 10},
'code': 'DI1'},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 7.185},
'symb': 'DI1H19'},
{'SctyQtn': {'bottomLmtPric': 11.29,
'prvsDayAdjstmntPric': 12.236,
'topLmtPric': 13.47},
'asset': {'AsstSummry': {'mtrtyCode': '2025-07-01', 'opnCtrcts': 3485},
'code': 'DI1'},
'mkt': {'cd': 'FUT'},
'symb': 'DI1N25'},
{'SctyQtn': {'avrgPric': 9.6967,
'bottomLmtPric': 8.89,
'curPrc': 9.68,
'maxPric': 9.85,
'minPric': 9.63,
'opngPric': 9.7,
'prvsDayAdjstmntPric': 9.766,
'topLmtPric': 10.9},
'asset': {'AsstSummry': {'grssAmt': 14461876431.2,
'mtrtyCode': '2021-01-04',
'opnCtrcts': 1589400,
'tradQty': 11304,
'traddCtrctsQty': 179775},
'code': 'DI1'},
'buyOffer': {'price': 9.67},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 9.68},
'symb': 'DI1F21'},
{'SctyQtn': {'avrgPric': 9.1373,
'bottomLmtPric': 8.35,
'curPrc': 9.13,
'maxPric': 9.29,
'minPric': 9.08,
'opngPric': 9.1,
'prvsDayAdjstmntPric': 9.186,
'topLmtPric': 10.28},
'asset': {'AsstSummry': {'grssAmt': 1676360397.45,
'mtrtyCode': '2020-07-01',
'opnCtrcts': 1438827,
'tradQty': 2742,
'traddCtrctsQty': 19685},
'code': 'DI1'},
'buyOffer': {'price': 9.12},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 9.13},
'symb': 'DI1N20'},
{'SctyQtn': {'avrgPric': 10.8811,
'bottomLmtPric': 9.96,
'curPrc': 10.97,
'maxPric': 10.97,
'minPric': 10.78,
'opngPric': 10.78,
'prvsDayAdjstmntPric': 10.885,
'topLmtPric': 12.08},
'asset': {'AsstSummry': {'grssAmt': 3106685.3,
'mtrtyCode': '2022-04-01',
'opnCtrcts': 16160,
'tradQty': 7,
'traddCtrctsQty': 45},
'code': 'DI1'},
'buyOffer': {'price': 10.78},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 10.81},
'symb': 'DI1J22'},
{'SctyQtn': {'avrgPric': 11.7735,
'bottomLmtPric': 10.89,
'curPrc': 11.7,
'maxPric': 11.91,
'minPric': 11.69,
'opngPric': 11.74,
'prvsDayAdjstmntPric': 11.836,
'topLmtPric': 13.06},
'asset': {'AsstSummry': {'grssAmt': 88173754.85,
'mtrtyCode': '2024-01-02',
'opnCtrcts': 63830,
'tradQty': 247,
'traddCtrctsQty': 1595},
'code': 'DI1'},
'buyOffer': {'price': 11.69},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 11.71},
'symb': 'DI1F24'},
{'SctyQtn': {'avrgPric': 10.0743,
'bottomLmtPric': 9.1,
'curPrc': 10.08,
'maxPric': 10.08,
'minPric': 10.07,
'opngPric': 10.07,
'prvsDayAdjstmntPric': 9.996,
'topLmtPric': 11.15},
'asset': {'AsstSummry': {'grssAmt': 2730323.55,
'mtrtyCode': '2021-04-01',
'opnCtrcts': 57813,
'tradQty': 5,
'traddCtrctsQty': 35},
'code': 'DI1'},
'buyOffer': {'price': 9.92},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 9.94},
'symb': 'DI1J21'},
{'SctyQtn': {'avrgPric': 11.3251,
'bottomLmtPric': 10.43,
'curPrc': 11.29,
'maxPric': 11.49,
'minPric': 11.24,
'opngPric': 11.27,
'prvsDayAdjstmntPric': 11.375,
'topLmtPric': 12.59},
'asset': {'AsstSummry': {'grssAmt': 2902365222.1,
'mtrtyCode': '2023-01-02',
'opnCtrcts': 643495,
'tradQty': 5563,
'traddCtrctsQty': 46221},
'code': 'DI1'},
'buyOffer': {'price': 11.28},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 11.29},
'symb': 'DI1F23'},
{'SctyQtn': {'bottomLmtPric': 6.043,
'prvsDayAdjstmntPric': 6.394,
'topLmtPric': 6.743},
'asset': {'AsstSummry': {'mtrtyCode': '2018-09-03', 'opnCtrcts': 794385},
'code': 'DI1'},
'buyOffer': {'price': 6.391},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 6.394},
'symb': 'DI1U18'},
{'SctyQtn': {'avrgPric': 10.9889,
'bottomLmtPric': 10.12,
'curPrc': 10.98,
'maxPric': 11.18,
'minPric': 10.96,
'opngPric': 11.01,
'prvsDayAdjstmntPric': 11.055,
'topLmtPric': 12.25},
'asset': {'AsstSummry': {'grssAmt': 751347046.85,
'mtrtyCode': '2022-07-01',
'opnCtrcts': 107601,
'tradQty': 378,
'traddCtrctsQty': 11210},
'code': 'DI1'},
'buyOffer': {'price': 10.98},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 10.99},
'symb': 'DI1N22'},
{'SctyQtn': {'avrgPric': 6.525,
'bottomLmtPric': 6.025,
'curPrc': 6.525,
'maxPric': 6.525,
'minPric': 6.525,
'opngPric': 6.525,
'prvsDayAdjstmntPric': 6.528,
'topLmtPric': 7.025},
'asset': {'AsstSummry': {'grssAmt': 49414005.0,
'mtrtyCode': '2018-11-01',
'opnCtrcts': 388520,
'tradQty': 8,
'traddCtrctsQty': 500},
'code': 'DI1'},
'buyOffer': {'price': 6.51},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 6.56},
'symb': 'DI1X18'},
{'SctyQtn': {'avrgPric': 7.3144,
'bottomLmtPric': 6.695,
'curPrc': 7.32,
'maxPric': 7.41,
'minPric': 7.26,
'opngPric': 7.28,
'prvsDayAdjstmntPric': 7.341,
'topLmtPric': 8.115},
'asset': {'AsstSummry': {'grssAmt': 2331794391.85,
'mtrtyCode': '2019-04-01',
'opnCtrcts': 818987,
'tradQty': 391,
'traddCtrctsQty': 24305},
'code': 'DI1'},
'buyOffer': {'price': 7.315},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 7.325},
'symb': 'DI1J19'},
{'SctyQtn': {'avrgPric': 6.4435,
'bottomLmtPric': 6.015,
'curPrc': 6.448,
'maxPric': 6.45,
'minPric': 6.435,
'opngPric': 6.45,
'prvsDayAdjstmntPric': 6.447,
'topLmtPric': 6.875},
'asset': {'AsstSummry': {'grssAmt': 6047420821.25,
'mtrtyCode': '2018-10-01',
'opnCtrcts': 2472721,
'tradQty': 133,
'traddCtrctsQty': 60850},
'code': 'DI1'},
'buyOffer': {'price': 6.446},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 6.448},
'symb': 'DI1V18'},
{'SctyQtn': {'avrgPric': 12.2392,
'bottomLmtPric': 11.39,
'curPrc': 12.2,
'maxPric': 12.41,
'minPric': 12.2,
'opngPric': 12.26,
'prvsDayAdjstmntPric': 12.334,
'topLmtPric': 13.57},
'asset': {'AsstSummry': {'grssAmt': 13930258.0,
'mtrtyCode': '2026-01-02',
'opnCtrcts': 78158,
'tradQty': 40,
'traddCtrctsQty': 325},
'code': 'DI1'},
'buyOffer': {'price': 12.19},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 12.21},
'symb': 'DI1F26'},
{'SctyQtn': {'avrgPric': 9.439,
'bottomLmtPric': 8.64,
'curPrc': 9.51,
'maxPric': 9.57,
'minPric': 9.4,
'opngPric': 9.4,
'prvsDayAdjstmntPric': 9.496,
'topLmtPric': 10.61},
'asset': {'AsstSummry': {'grssAmt': 1046752634.45,
'mtrtyCode': '2020-10-01',
'opnCtrcts': 219310,
'tradQty': 62,
'traddCtrctsQty': 12645},
'code': 'DI1'},
'buyOffer': {'price': 9.41},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 9.44},
'symb': 'DI1V20'},
{'SctyQtn': {'bottomLmtPric': 10.56,
'prvsDayAdjstmntPric': 11.509,
'topLmtPric': 12.72},
'asset': {'AsstSummry': {'mtrtyCode': '2023-04-03', 'opnCtrcts': 11610},
'code': 'DI1'},
'mkt': {'cd': 'FUT'},
'symb': 'DI1J23'},
{'SctyQtn': {'avrgPric': 10.2088,
'bottomLmtPric': 9.37,
'curPrc': 10.18,
'maxPric': 10.35,
'minPric': 10.14,
'opngPric': 10.14,
'prvsDayAdjstmntPric': 10.276,
'topLmtPric': 11.45},
'asset': {'AsstSummry': {'grssAmt': 1141539998.05,
'mtrtyCode': '2021-07-01',
'opnCtrcts': 407600,
'tradQty': 989,
'traddCtrctsQty': 15035},
'code': 'DI1'},
'buyOffer': {'price': 10.17},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 10.18},
'symb': 'DI1N21'},
{'SctyQtn': {'avrgPric': 7.0568,
'bottomLmtPric': 6.405,
'curPrc': 7.02,
'maxPric': 7.065,
'minPric': 7.02,
'opngPric': 7.065,
'prvsDayAdjstmntPric': 7.01,
'topLmtPric': 7.7},
'asset': {'AsstSummry': {'grssAmt': 22816998.75,
'mtrtyCode': '2019-02-01',
'opnCtrcts': 198230,
'tradQty': 29,
'traddCtrctsQty': 235},
'code': 'DI1'},
'buyOffer': {'price': 6.99},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 7.02},
'symb': 'DI1G19'},
{'SctyQtn': {'avrgPric': 7.7849,
'bottomLmtPric': 7.12,
'curPrc': 7.775,
'maxPric': 7.9,
'minPric': 7.715,
'opngPric': 7.73,
'prvsDayAdjstmntPric': 7.817,
'topLmtPric': 8.7},
'asset': {'AsstSummry': {'grssAmt': 3488606085.5,
'mtrtyCode': '2019-07-01',
'opnCtrcts': 791673,
'tradQty': 1523,
'traddCtrctsQty': 37135},
'code': 'DI1'},
'buyOffer': {'price': 7.77},
'mkt': {'cd': 'FUT'},
'sellOffer': {'price': 7.78},
'symb': 'DI1N19'},
{'SctyQtn': {'avrgPric': 12.0531,
'bottomLmtPric': 11.16,
'curPrc': 12.01,
'maxPric': 12.23,
'minPric': 11.99,
'opngPric': 12.03,
'prvsDayAdjstmntPric': 12.114,
'topLmtPric': 13.35},
'asset': {'AsstSummry': {'grssAmt': 1748133912.1,
'mtrtyCode': '2025-01-02',
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