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augmentedtree enhances mappings and sequences (targeted for python dictionaries and lists) preserving their native behavior and access. The enhancement comes with getting values by single keys, human readable viewing, selecting and setting multiple values/items within the nested data at once, or-conditional selection of values/items. Also this package intends to prepare the nested data for pyQt. The augmentation provides methods and properties to be used for a QAbstractItemModel showing the nested data within a QTreeView.


Installing the latest release using pip is recommended.

$ pip install augmentedtree

The latest development state can be obtained from gitlab using pip.

$ pip install git+

Purpose of augmentedtree

The main purpose of this package is enhance nested data structure (mostly nested dictionaries) by keeping its functionality for methods working with these data types.

The targeted usage is to be able to write the following kind of code

# code where the nested data comes from

# gathering parameters
with AugmentedTree(nested_data) as tree:
   # simple selection
   first_value ="something", "here")[0]
   last_value ="something", "there")[-1]
   a_slice_of_values ="a", "l?t", "of")[3:6]

   # selection with refinement
   selection_of_values ="also/a", "lot", "of")
   narrowed_down = selection_of_values.where("this", "or", "that")[ALL_ITEMS]

if not tree.all_selections_succeeded:
    # break, exit or reacting to some value are not there

# code which is working with requested parameters


The augmented tree items are directly forwarding the nested data. Practically objects implementing and should work with this package. Nevertheless:

  • This package was developed with using list and dict. Other classes weren’t tested yet.
  • Keep in mind that inserting new items directly into the nested data will mess up the augmentation. If AnAugmentedTreeItem should keep track of new items usage of this layer is mandatory.

The development status is alpha.

  • Changes will come.
  • Definition of types for fields in MappingTreeItem will be implemented.
  • Selection items will be reworked. (SPARQL support is a desirable option.)