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lxml生成XML对象时抛错?

描述问题

详细过程见代码

上下文环境

---
Metadata-Version: 1.1
Name: lxml
Version: 3.5.0
Summary: Powerful and Pythonic XML processing library combining libxml2/libxslt with the ElementTree API.
Home-page: http://lxml.de/
Author: lxml dev team
Author-email: lxml-dev@lxml.de
License: UNKNOWN
Location: /usr/lib/python2.7/dist-packages
Requires: 
Classifiers:
  Development Status :: 5 - Production/Stable
  Intended Audience :: Developers
  Intended Audience :: Information Technology
  License :: OSI Approved :: BSD License
  Programming Language :: Cython
  Programming Language :: Python :: 2
  Programming Language :: Python :: 2.6
  Programming Language :: Python :: 2.7
  Programming Language :: Python :: 3
  Programming Language :: Python :: 3.2
  Programming Language :: Python :: 3.3
  Programming Language :: Python :: 3.4
  Programming Language :: Python :: 3.5
  Programming Language :: C
  Operating System :: OS Independent
  Topic :: Text Processing :: Markup :: HTML
  Topic :: Text Processing :: Markup :: XML
  Topic :: Software Development :: Libraries :: Python Modules

重现

相关代码

from lxml.etree import XML

doc = """
<?xml version="1.0" encoding="utf-8"?>
<wikimedia>
  <projects>
    <project name="Wikipedia" launch="2001-01-05">
      <editions>
        <edition language="English">en.wikipedia.org</edition>
        <edition language="German">de.wikipedia.org</edition>
        <edition language="French">fr.wikipedia.org</edition>
        <edition language="Polish">pl.wikipedia.org</edition>
        <edition language="Spanish">es.wikipedia.org</edition>
      </editions>
    </project>
    <project name="Wiktionary" launch="2002-12-12">
      <editions>
        <edition language="English">en.wiktionary.org</edition>
        <edition language="French">fr.wiktionary.org</edition>
        <edition language="Vietnamese">vi.wiktionary.org</edition>
        <edition language="Turkish">tr.wiktionary.org</edition>
        <edition language="Spanish">es.wiktionary.org</edition>
      </editions>
    </project>
  </projects>
</wikimedia>"""

page = XML(doc)

报错信息

XMLSyntaxError: XML declaration allowed only at the start of the document, line 2, column 6

相关截图

已经尝试哪些方法仍然没有解决(附上相关链接)

  1. google-搜索的信息, 但是看不懂

问题简化

xml字符串如果第一行是文档声明，一定要放在第一行，这个是标准，后面不要有"\n"
https://msdn.microsoft.com/zh-cn/library/ms256048.aspx
或者你用代码strip下

doc = """<?xml version="1.0" encoding="utf-8"?>
<wikimedia>
  <projects>
    <project name="Wikipedia" launch="2001-01-05">
      <editions>
        <edition language="English">en.wikipedia.org</edition>
        <edition language="German">de.wikipedia.org</edition>
        <edition language="French">fr.wikipedia.org</edition>
        <edition language="Polish">pl.wikipedia.org</edition>
        <edition language="Spanish">es.wikipedia.org</edition>
      </editions>
    </project>
    <project name="Wiktionary" launch="2002-12-12">
      <editions>
        <edition language="English">en.wiktionary.org</edition>
        <edition language="French">fr.wiktionary.org</edition>
        <edition language="Vietnamese">vi.wiktionary.org</edition>
        <edition language="Turkish">tr.wiktionary.org</edition>
        <edition language="Spanish">es.wiktionary.org</edition>
      </editions>
    </project>
  </projects>
</wikimedia>"""
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