Python将BeautifulSoup输出转换为Set？

Question

In python I have:

def tag_visible(element):
    return True


def get_visible_text(soup):
    text_tags = soup.find_all(text=True)
    visible_texts = filter(tag_visible, text_tags)
    stripped = set()
    for text in visible_texts:
        stripped.add(text.strip())
    return stripped

I have 2 questions:

1. How to convert visible_texts into set in one line?

2. Is there a data structure in python like set (no duplicates) and preserves order of elements?

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UPDATE:

I can do:

return set(visible_texts)

But how to apply strip function ?

Answer 1

dict s preserve insertion order. dict s contain key-value pairs. In this case, you don't care about the value, so it's always set to True .

I'm not too sure what you are trying to achieve by using filter with a function that always returns True . Please clarify.

def get_visible_text(soup):
    text_tags = soup.find_all(text=True)
    return dict((text.strip(), True) for text in text_tags)

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You can apply the strip function by using a set comprehension :

return set(text.strip() for text in visible_texts)

Note, however, that the insertion order is not necessarily preserved.