python - 安装错误认为 pythonpath 是空的

Question

我正在尝试安装 scikits.nufft 包 here我下载 zip 文件，解压并 cd 到目录。它包含一个 setup.py 文件，所以我运行

python setup.py install

但它给了我以下与我的 PYTHONPATH 相关的错误

sudo python setup.py install
sudo: unable to resolve host Lenovo
/usr/local/lib/python2.7/dist-packages/distribute-0.6.31-py2.7.egg/setuptools/command/install_scripts.py:3: UserWarning: Module dap was already imported from None, but /usr/lib/python2.7/dist-packages is being added to sys.path
  from pkg_resources import Distribution, PathMetadata, ensure_directory
running install
Checking .pth file support in /usr/local/lib/python2.7/site-packages/
/usr/bin/python -E -c pass
TEST FAILED: /usr/local/lib/python2.7/site-packages/ does NOT support .pth files
error: bad install directory or PYTHONPATH

You are attempting to install a package to a directory that is not
on PYTHONPATH and which Python does not read ".pth" files from.  The
installation directory you specified (via --install-dir, --prefix, or
the distutils default setting) was:

    /usr/local/lib/python2.7/site-packages/

and your PYTHONPATH environment variable currently contains:

    ''

Here are some of your options for correcting the problem:

* You can choose a different installation directory, i.e., one that is
  on PYTHONPATH or supports .pth files

* You can add the installation directory to the PYTHONPATH environment
  variable.  (It must then also be on PYTHONPATH whenever you run
  Python and want to use the package(s) you are installing.)

* You can set up the installation directory to support ".pth" files by
  using one of the approaches described here:

  http://packages.python.org/distribute/easy_install.html#custom-installation-locations

Please make the appropriate changes for your system and try again.

它似乎认为路径是空的，但是当我检查我的路径时，我得到了，

echo $PYTHONPATH
/usr/local/lib/python2.7/site-packages:/home/david/PYTHON

有谁知道为什么它可能认为路径是空的？？或者对这里可能出现的问题有任何其他想法。谢谢，戴夫

Answer 1

在 Aya 的上述评论之后，我发现了类似的已解决问题 here并通过添加

使其运行

Defaults    env_keep += "PYTHONPATH"

到 sudoers 文件。塔，戴夫