namespacedict 0.1.0

This package provides a NamespaceDict mapping which fully evaluates keys using Python. For example, it can perform nested lookups, attribute lookups, and tuple splicing:

>>> from namespacedict import NamespaceDict
>>>
>>> # create a new namespace
>>> ns = NamespaceDict()
>>>
>>> # nested lookup from a list
>>> ns['x'] = [1, 2, 3]
>>> ns['x[1]']
2
>>> # set a docstring attribute
>>> ns['y'] = lambda x: x
>>> ns['y.__doc__'] = 'my function'
>>>
>>> # set three items from a tuple
>>> ns['a, b, c'] = 'A', 'B', 'C'
>>> ns['b']
'B'

Keys are parsed in a safe way using Python’s AST library. It is thus possible to create complex dictionary queries as expected:

>>> ns['one'] = 1
>>> ns['two'] = 2
>>> ns['x[0:two]'] = 5, 4
>>> ns['x[::-one]']
[3, 4, 5]