Question

我将import requests from bs4 import BeautifulSoup import pandas as pd headings=['Name','Accession Number','Type','Groups','Description'] # add more as needed, first hit on each is taken df = pd.DataFrame([], columns=headings) def get_details(url): global df global headings print('details:', url) r = requests.get(url) soup = BeautifulSoup(r.text ,"lxml") dts = soup.findAll('dt') dds = soup.findAll('dd') data = {} for dt, dd in zip(dts, dds): if (dt.text in headings) and (dt.text not in data): data[dt.text] = dd.text df = df.append(data,ignore_index=True) def drug_data(): url = 'https://www.drugbank.ca/drugs/' while url: print(url) r = requests.get(url) soup = BeautifulSoup(r.text ,"lxml") # get links to subpages links = soup.select('strong a') for link in links: # exeecute function to get subpage get_details('https://www.drugbank.ca' + link['href']) # next page url url = soup.findAll('a', {'class': 'page-link', 'rel': 'next'}) print(url) if url: url = 'https://www.drugbank.ca' + url[0].get('href') else: break drug_data() print df[['Name', 'Accession Number']]应用于.spin：它正在旋转图标。该图标已应用<i>，因此transform将包含原始.spin加transform一个：

第一种方法不起作用，原始rotate优先。我想知道为什么第二种方法有效？

注意：使用transform进行编译，因此使用Angular

Shadow Dom Emulation

将其更改为以下作品 - 不确定原因

// SCSS
.menu-button {    
    i {        
        transform: translate(-50%, -50%);        
    }
}
i.spin {
    transform: translate(-50%, -50%) rotate(90deg);
}


// CSS Compiled (compiled with Angular, so using Shadow Dom Emulation)
.menu-button[_ngcontent-c4] { }

.menu-button[_ngcontent-c4] i[_ngcontent-c4] {
    transform: translate(-50%, -50%);
}

i.spin[_ngcontent-c4] {  
    transform: translate(-50%, -50%) rotate(90deg); 
}

Answer 1

这与SCSS或Angular没有任何关系，只是与CSS优先级规则有关。

在您的第一种方法中，前一条规则更具体，因此优先于后者。

SCSS到CSS，应用属性选择器的嵌套标签/类的特异性？

1 个答案: