python - 导入错误 : No module named '_version' when importing mechanize

Question

我通过 pip 安装 mechanize 并在导入模块时出现错误:

$ python
Python 3.5.2 (default, Jun 28 2016, 08:46:01) 
[GCC 6.1.1 20160602] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import mechanize
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3.5/site-packages/mechanize/__init__.py", line 119, in <module>
    from _version import __version__
ImportError: No module named '_version'

文件 -version.py 存在于站点包目录中:

$ ls /usr/lib/python3.5/site-packages/mechanize
_auth.py               __init__.py           _response.py
_beautifulsoup.py      _lwpcookiejar.py      _rfc3986.py
_clientcookie.py       _markupbase.py        _sgmllib_copy.py
_debug.py              _mechanize.py         _sockettimeout.py
_firefox3cookiejar.py  _mozillacookiejar.py  _testcase.py
_form.py               _msiecookiejar.py     _urllib2_fork.py
_gzip.py               _opener.py            _urllib2.py
_headersutil.py        _pullparser.py        _useragent.py
_html.py               __pycache__           _util.py
_http.py               _request.py           _version.py

我错过了什么？

Answer 1

如果你看setup.py你会看到 mechanize 是一个 Python 2.x 包:

Programming Language :: Python
Programming Language :: Python :: 2
Programming Language :: Python :: 2.4
Programming Language :: Python :: 2.5
Programming Language :: Python :: 2.6
Programming Language :: Python :: 2.7

除此之外，您可以在 mechanize/__init__.py 中看到所有导入都是相对的:

from _version import __version__

而不是明确的:

from ._version import __version__

In python 3, this results in import errors.

有一个 issue为 Py3 支持而打开，它列出了一些您可以尝试的替代方案。那个，或者移植它 :-)。