Prevent BeautifulSoup's renderContents() from

问题:

I'm using bs4 to do some work on some text, but in some cases it converts   characters to Â. The best I can tell is that this is an encoding mismatch from UTF-8 to latin1 (or reverse?)

Everything in my web app is UTF-8, Python3 is UTF-8, and I've confirmed the database is UTF-8.

I've narrowed down the problem to this one line:

print("Before soup: " + text)  # Before soup:  
soup = BeautifulSoup(text, "html.parser")
#.... do stuff to soup, but all commented out for this testing.
soup = BeautifulSoup(soup.renderContents(), "html.parser")  # <---- PROBLEM!
print(soup.renderContents())  # b'\xc3\x82\xc2\xa0'
print("After SOUP: " + str(soup))  # After SOUP: Â

How do I prevent renderContents() from changing the encoding? There is no documentation on this function!

Edit: Upon further research into the docs, this seems to be the key, but I still can't fix the problem!

print(soup.prettify(formatter="html"))  #  

回答1:

Ok, apparently I hadn't read deep enough in to the docs, here's where the answer can be found:

From https://www.crummy.com/software/BeautifulSoup/bs4/doc/#encodings:

The problem is that the snippet of code provided to BS is so short, that BeautifulSoup's sub-library Unicode, Dammit, doesn't have enough info to properly guess the encoding.

Unicode, Dammit guesses correctly most of the time, but sometimes it makes mistakes. ...you can avoid mistakes and delays by passing it to the BeautifulSoup constructor as from_encoding.

So the key is to add from_encoding="UTF-8" to each time the BS is constructed:

soup = BeautifulSoup(soup.renderContents(), "html.parser", from_encoding="UTF-8")