问题描述
有没有办法在不修改现有脚本的情况下告诉 Python 其他 site-packages 位置?
在我的 CentOS 5.5 服务器上，我有一个安装在 /opt/python2.7.2 中的 Python 2.7 安装，并且 中有一个 .site-packages 文件夹/opt/python2.7.2/lib/python2.7/site-packages
这样做的原因是我不想干扰 5.5 发行版附带的现有 Python 2.4 安装.
然而，第三方 Python 应用程序还在 /usr/local/lib/python2.7/site-packages 添加了一个 site-packages 文件夹，并将其自身安装在那个位置.
这部分是我的错，因为我没有在安装之前调整应用程序的 Makefile 中的 PREFIX，但是我现在无能为力.
我知道我可以做到:
导入系统；sys.path.insert(0, "/usr/local/lib/python2.7/site-packages")但是，这将涉及我跟踪每个脚本并添加上述内容，如果将来有更新，这并不理想.
为了解决这个问题，我在 /opt/python2.7.2/lib/python2.7/site-packages 中创建了一个指向此第三方应用程序位置的符号链接:
这似乎工作正常，但我想知道是否有更好的方法?
您可以使用 Site-具体配置钩子.
<块引用>"路径配置文件是一个文件名，格式为name.pth，存在于上述四个目录之一中；其内容是要添加的附加项(每行一个)到 sys.path."
在您的情况下，您应该能够通过简单地放入包含要包含的目录路径的 .pth 文件来实现您想要的:
[root@home]$ echo "/usr/local/lib/python2.7/site-packages/" >/opt/python2.7.2/lib/python2.7/site-packages/usrlocal.pthIs there a way to tell Python about additional site-packages locations without modifying existing scripts?
On my CentOS 5.5 server I have a Python 2.7 installation that is installed in /opt/python2.7.2 and there is a site-packages folder at /opt/python2.7.2/lib/python2.7/site-packages.
The reason for this is that I didn't want to disturb the existing Python 2.4 install that shipped with the 5.5 distribution.
However a third party Python application also added a site-packages folder at: /usr/local/lib/python2.7/site-packages and installed itself at that location.
This is partly my fault because I didn't tweak the PREFIX in the application's Makefile before installing, however there's not much I can do about it now.
I know that I can do this:
import sys; sys.path.insert(0, "/usr/local/lib/python2.7/site-packages")
However it would involve me tracking down every script and adding the above which is not ideal should there be updates in the future.
To get around this I created a symbolic link in /opt/python2.7.2/lib/python2.7/site-packages to the location of this third party application:
ln -sf /usr/local/lib/python2.7/site-packages/theapp /opt/python2.7.2/lib/python2.7/site-packages/theapp
This appears to work fine but I'm wondering if there's a better way?
You can use the Site-specific configuration hook.
"A path configuration file is a file whose name has the form
name.pthand exists in one of the four directories mentioned above; its contents are additional items (one per line) to be added tosys.path."
In your case, you should be able to achieve what you want by simply dropping in a .pth file containing the path of the directory to include:
[root@home]$ echo "/usr/local/lib/python2.7/site-packages/" > /opt/python2.7.2/lib/python2.7/site-packages/usrlocal.pth
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