如何替换这个嵌套循环？

Question

这里的目标是从网站获取文本并将其附加到列表中，这样我就可以从中创建一个数据框。经过大量 Google 我设法做到了这一点，但现在我明白这不是最有效的方法，一直在研究列表理解但未能获得成功的结果。

containers = soup.find_all('td', class_=['TableRecords_EvenLine', 'TableRecords_OddLine'])

dateli = []
descli = []
amtli = []

for container in containers:
    date = container.select('div[id*=wtDataMov]')
    for element1 in date:
        seci1 = element1.get_text()
        dateli.append(seci1)
    description = container.select('div[id*=wtDescricao]')
    for element2 in description:
        seci2 = element2.get_text()
        descli.append(seci2)
    amount = container.select('div[id*=wtValorEur]')
    for element3 in amount:
        seci3 = element3.get_text()
        amtli.append(float(price_str(seci3)))

想法？谢谢你的时间。

Answer 1

如果你想使用列表理解来完成它，它看起来像这样

containers = soup.find_all('td', class_=['TableRecords_EvenLine', 'TableRecords_OddLine'])

dateli = []
descli = []
amtli = []

for container in containers:
    dateli += [e.get_text() for e in container.select('div[id*=wtDataMov]')]
    descli += [e.get_text() for e in container.select('div[id*=wtDescricao]')]
    amtli  += [float(price_str(e.get_text())) for e in container.select('div[id*=wtValorEur]')]

如何替换这个嵌套循环？

How to replace this nested loop?

list

beautifulsoup

nested-loops

web-scraping