#!/usr/bin/env python
# -*- coding: utf-8 -*-
# File: utils.py
#
# Copyright 2018 Costas Tyfoxylos
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the "Software"), to
# deal in the Software without restriction, including without limitation the
# rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
# sell copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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"""
Main code for utils.
.. _Google Python Style Guide:
http://google.github.io/styleguide/pyguide.html
"""
__author__ = '''Costas Tyfoxylos <ctyfoxylos@schubergphilis.com>'''
__docformat__ = '''google'''
__date__ = '''2018-05-24'''
__copyright__ = '''Copyright 2018, Costas Tyfoxylos'''
__credits__ = ["Costas Tyfoxylos"]
__license__ = '''MIT'''
__maintainer__ = '''Costas Tyfoxylos'''
__email__ = '''<ctyfoxylos@schubergphilis.com>'''
__status__ = '''Development''' # "Prototype", "Development", "Production".
[docs]class RecursiveDictionary(dict):
"""Implements recursively updating dictionary.
RecursiveDictionary provides the methods update and iter_rec_update
that can be used to update member dictionaries rather than overwriting
them.
"""
[docs] def update(self, other, **third):
"""Implements the recursion.
Recursively update the dictionary with the contents of other and
third like dict.update() does - but don't overwrite sub-dictionaries.
"""
try:
iterator = other.items()
except AttributeError:
iterator = other
self.iter_rec_update(iterator)
self.iter_rec_update(third.items())
[docs] def iter_rec_update(self, iterator):
"""Updates recursively."""
for (key, value) in iterator:
if key in self and isinstance(self[key], dict) and isinstance(value, dict):
self[key] = RecursiveDictionary(self[key])
self[key].update(value)
else:
self[key] = value