python - lxml etree.iterparse 错误“TypeError：读取文件对象必须返回纯字符串”

Question

我想使用 lxml 解析 HTML 文档。我正在使用 python 3.2.3 和 lxml 2.3.4 ( http://www.lfd.uci.edu/~gohlke/pythonlibs/#lxml )

我正在使用etree.iterparse解析文档，但它返回以下运行时错误：

Traceback (most recent call last):
  File "D:\Eclipse Projects\Python workspace\Crawler\crawler.py", line 12, in <module>
    for event, elements in etree.iterparse(some_file_like):
  File "iterparse.pxi", line 491, in lxml.etree.iterparse.__next__ (src/lxml\lxml.etree.c:98565)
  File "iterparse.pxi", line 512, in lxml.etree.iterparse._read_more_events (src/lxml\lxml.etree.c:98768)
TypeError: reading file objects must return plain strings

问题是：如何解决这个运行时错误？

非常感谢。

这是代码：

from io import StringIO
from lxml import etree

some_file_like = StringIO("<root><a>data</a></root>")

for event, elements in etree.iterparse(some_file_like): #<-- Run-time error happens here
    print("%s, %4s, %s" % (event, elements.tag, elements.text))

Answer 1

您的 StringIO 缓冲区具有 unicode 字符串。iterparse适用于返回字节的文件之类的对象。以下缓冲区应与 iterparse 一起使用：

from io import BytesIO
some_file_like = BytesIO("<root><a>data</a></root>".encode('utf-8'))