configclass

configclass - A Python to class to hold configuration values

A Config is a dict with a where:

existing items can be modified but no items can not be added

has make() method so you can easily created derived configs

make() has the same API as dict.update()

make() will merge values according to mergedict.ConfigDict.merge()

for convenience, make can take a None to perform a simple copy

>>> from configclass import Config

>>> c1 = Config({'a': 1, 'b': ['foo']})

# can't add new items to config
>>> c1.make({'a':2, 'c': [2]})
Traceback (most recent call last):
KeyError: 'New items can not be added to Config, invalid key:c'

# new config object created
>>> c2 = c1.make({'a':2})
>>> c2
Config({'a': 2, 'b': ['foo']})

# original object is not modified
>>> c1
Config({'a': 1, 'b': ['foo']})

# make() can take keyword arguments, note how lists are merged
>>> c2.make(b=['bar'])
Config({'a': 2, 'b': ['foo', 'bar']})

configclass.ConfigMixin can be used to create a Config class that is not based on mergedict.ConfigDict. Check unittests for usage.