来自外部部分的 Python ConfigParser 插值

Question

使用 Python ConfigParser，是否可以跨外部部分使用插值？我的想法似乎告诉我，我在某处看到它是可能的，但我在搜索时找不到它。

此示例不起作用，但它可以让您了解我正在尝试做什么。

[section1]
root = /usr

[section2]
root = /usr/local

[section3]
dir1 = $(section1:root)/bin
dir2 = $(section2:root)/bin

请注意，我使用的是 Python 2.4。

Answer 1

在 python 3.2 及更高版本中，这是完全有效的:

[Common]
home_dir: /Users
library_dir: /Library
system_dir: /System
macports_dir: /opt/local

[Frameworks]
Python: 3.2
path: ${Common:system_dir}/Library/Frameworks/

[Arthur]
nickname: Two Sheds
last_name: Jackson
my_dir: ${Common:home_dir}/twosheds
my_pictures: ${my_dir}/Pictures
python_dir: ${Frameworks:path}/Python/Versions/${Frameworks:Python}

---

编辑:

我刚看到你用的是python 2.4，所以不行，python 2.4。它是在 python 3.2 中引入的 - See section 13.2.5 - ConfigParser Interpolation of values .

class configparser.ExtendedInterpolation

An alternative handler for interpolation which implements a more advanced syntax, used for instance in zc.buildout. Extended interpolation is using ${section:option} to denote a value from a foreign section. Interpolation can span multiple levels. For convenience, if the section: part is omitted, interpolation defaults to the current section (and possibly the default values from the special section). For example, the configuration specified above with basic interpolation, would look like this with extended interpolation:

   [Paths]
   home_dir: /Users
   my_dir: ${home_dir}/lumberjack
   my_pictures: ${my_dir}/Pictures

Values from other sections can be fetched as well:

   [Common]
   home_dir: /Users
   library_dir: /Library
   system_dir: /System
   macports_dir: /opt/local

   [Frameworks]
   Python: 3.2
   path: ${Common:system_dir}/Library/Frameworks/

   [Arthur]
   nickname: Two Sheds
   last_name: Jackson
   my_dir: ${Common:home_dir}/twosheds
   my_pictures: ${my_dir}/Pictures
   python_dir: ${Frameworks:path}/Python/Versions/${Frameworks:Python}