問題描述
有沒有辦法在不修改現有腳本的情況下告訴 Python 其他 site-packages 位置?
在我的 CentOS 5.5 服務器上，我有一個安裝在 /opt/python2.7.2 中的 Python 2.7 安裝，并且 中有一個 .site-packages 文件夾/opt/python2.7.2/lib/python2.7/site-packages
這樣做的原因是我不想干擾 5.5 發行版附帶的現有 Python 2.4 安裝.
然而，第三方 Python 應用程序還在 /usr/local/lib/python2.7/site-packages 添加了一個 site-packages 文件夾，并將其自身安裝在那個位置.
這部分是我的錯，因為我沒有在安裝之前調整應用程序的 Makefile 中的 PREFIX，但是我現在無能為力.
我知道我可以做到:
導入系統；sys.path.insert(0, "/usr/local/lib/python2.7/site-packages")但是，這將涉及我跟蹤每個腳本并添加上述內容，如果將來有更新，這并不理想.
為了解決這個問題，我在 /opt/python2.7.2/lib/python2.7/site-packages 中創建了一個指向此第三方應用程序位置的符號鏈接:
這似乎工作正常，但我想知道是否有更好的方法?
您可以使用 Site-具體配置鉤子.
<塊引用>"路徑配置文件是一個文件名，格式為name.pth，存在于上述四個目錄之一中；其內容是要添加的附加項(每行一個)到 sys.path."
在您的情況下，您應該能夠通過簡單地放入包含要包含的目錄路徑的 .pth 文件來實現您想要的:
[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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