ImportError:导入mechanize时没有名为'_version'的模块

Question

我通过pip安装了mechanize并在导入模块时获得了错误:

$ 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'

该文件-version.py存在于site-packages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

如果你看看setup.py你会看到mechanize一个Python 2.x包裹:

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,您可以看到mechanize/__init__.py所有进口都是相对的:

from _version import __version__

而不是明确的:

from ._version import __version__

在python 3中,这会导致导入错误.

有一个问题需要Py3支持,它列出了一些您可以尝试的替代方案.那,或者说它:-).