如何在Python中使用Javascript对象文字
[英]How do I work with Javascript Object Literals in Python
问题描述
Through Beautifulsoup module I have extracted an HTML page. 
通过Beautifulsoup模块，我提取了一个HTML页面。 From that page, I further extracted a Javascript script tag. 从该页面，我进一步提取了Javascript脚本标签。 Inside the script tag, there is an object literal that I would like to work with. 在script标记内，有一个我想使用的对象文字。 You can see what I would like to achieve: 您可以看到我想要实现的目标：
<script>
var main_obj = {
"link":"",
"stock":"",
"price":[{"qty":1000,"value":"100$"}, {"qty":10000,"value":"1000$"}]
}
</script>
I would like to access the qty and value variables inside the object literals of price variable which is inside main_obj. 我想访问位于main_obj内部的price变量的对象常量内的qty和value变量。 Thankyou 谢谢
1 个解决方案
解决方案1
1 已采纳 2018-06-05 23:31:14
One option would be to use selenium . 一种选择是使用selenium 。 In particular, you can use execute_script to convert to a JSON string which Python can easily parse. 特别是，您可以使用execute_script转换为Python可以轻松解析的JSON字符串。
Since I don't know what the URL of the page you are working with is, I just created a local HTML file which included your script tag example. 由于我不知道您正在使用的页面的URL是什么，因此我刚刚创建了一个本地HTML文件，其中包含您的脚本标签示例。 Using headless is not mandatory and I only added that option so the browser window doesn't open. 使用无头不是必须的，我只是添加了该选项，因此浏览器窗口不会打开。
test.html
<!DOCTYPE html>
<html>
<body>
<script>
var main_obj = {
"link": "",
"stock": "",
"price": [{"qty": 1000, "value": "100$"}, {"qty": 10000, "value": "1000$"}]
}
</script>
</body>
</html>
Script 脚本
In[2]: import os
...: import json
...:
...: from selenium import webdriver
...:
...: chrome_options = webdriver.ChromeOptions()
...: chrome_options.add_argument('--headless')
...: driver = webdriver.Chrome(chrome_options=chrome_options)
...:
...: driver.get('file://{}/test.html'.format(os.getcwd()))
...: json_string = driver.execute_script('return JSON.stringify(main_obj)')
...: driver.quit()
...:
...: json_data = json.loads(json_string)
In[3]: json_data
Out[3]:
{'link': '',
'stock': '',
'price': [{'qty': 1000, 'value': '100$'}, {'qty': 10000, 'value': '1000$'}]}
In[4]: for item in json_data['price']:
...: print('Quantity: {:d}\tValue: ${:.2f}'.format(
...: item['qty'], float(item['value'].rstrip('$'))
...: ))
...:
Quantity: 1000 Value: $100.00
Quantity: 10000 Value: $1000.00
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