from urllib.request import urlopen
huck_fin_url = 'http://www.gutenberg.org/files/76/76-0.txt'
df = urlopen(huck_fin_url)
huck_fin_text = str(df.read())
huck_fin_chapters = huck_fin_text.split('CHAPTER ')[1:]
print(huck_fin_chapters)
你必须在df.read()前面添加str
