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©«Fc @ sL d Z d e f d „ ƒ YZ d e f d „ ƒ YZ d e f d „ ƒ YZ d S( s/ Implements basic mechanisms for managing configuration information
* A NAMESPACE is a collection of values and other namepsaces
* A VALUE is a basic value, like 3.1415, or 'Hello World!'
* A NAME identifies a value or namespace within a namespace
The ConfigNamespace class is an abstract class that defines the
basic interface implemented by all config namespace objects. Two
concrete implementations are included: BasicConfig and INIConfig.
Each is described in detail elsewhere. However, here's an
example of the capabilities available:
Create config namespace and populate it:
>>> n = BasicConfig()
>>> n.playlist.expand_playlist = True
>>> n.ui.display_clock = True
>>> n.ui.display_qlength = True
>>> n.ui.width = 150
Examine data:
>>> print n.playlist.expand_playlist
True
>>> print n['ui']['width']
150
>>> print n
playlist.expand_playlist = True
ui.display_clock = True
ui.display_qlength = True
ui.width = 150
Delete items:
>>> del n.playlist
>>> print n
ui.display_clock = True
ui.display_qlength = True
ui.width = 150
Convert it to ini format:
>>> from iniparse import ini
>>> i = ini.INIConfig()
>>> i.import_config(n)
>>> print i
[ui]
display_clock = True
display_qlength = True
width = 150
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c B s t Z d Z d „ Z d „ Z RS( s Helper class used to hold undefined names until assignment.
This class helps create any undefined subsections when an
assignment is made to a nested value. For example, if the
statement is "cfg.a.b.c = 42", but "cfg.a.b" does not exist yet.
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sZ Represents a collection of named values
Values are added using dotted notation:
>>> n = BasicConfig()
>>> n.x = 7
>>> n.name.first = 'paramjit'
>>> n.name.last = 'oberoi'
...and accessed the same way, or with [...]:
>>> n.x
7
>>> n.name.first
'paramjit'
>>> n.name.last
'oberoi'
>>> n['x']
7
The namespace object is a 'container object'. The default
iterator returns the names of values (i.e. keys).
>>> l = list(n)
>>> l.sort()
>>> l
['name', 'x']
Values can be deleted using 'del' and printed using 'print'.
>>> n.aaa = 42
>>> del n.x
>>> print n
aaa = 42
name.first = paramjit
name.last = oberoi
Nested namepsaces are also namespaces:
>>> isinstance(n.name, ConfigNamespace)
True
>>> print n.name
first = paramjit
last = oberoi
Finally, values can be read from a file as follows:
>>> from StringIO import StringIO
>>> sio = StringIO('''
... # comment
... ui.height = 100
... ui.width = 150
... complexity = medium
... have_python
... data.secret.password = goodness=gracious me
... ''')
>>> n = BasicConfig()
>>> n.readfp(sio)
>>> print n
complexity = medium
data.secret.password = goodness=gracious me
have_python
ui.height = 100
ui.width = 150
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