dictionary with fully evaluated keys
Project description
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]
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