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#!/usr/bin/env python3
#
# Copyright (C) 2019 VyOS maintainers and contributors
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License version 2 or later as
# published by the Free Software Foundation.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
class FixedDict(dict):
"""
FixedDict: A dictionnary not allowing new keys to be created after initialisation.
>>> f = FixedDict(**{'count':1})
>>> f['count'] = 2
>>> f['king'] = 3
File "...", line ..., in __setitem__
raise ConfigError(f'Option "{k}" has no defined default')
"""
def __init__(self, **options):
self._allowed = options.keys()
super().__init__(**options)
def __setitem__(self, k, v):
"""
__setitem__ is a builtin which is called by python when setting dict values:
>>> d = dict()
>>> d['key'] = 'value'
>>> d
{'key': 'value'}
is syntaxic sugar for
>>> d = dict()
>>> d.__setitem__('key','value')
>>> d
{'key': 'value'}
"""
if k not in self._allowed:
raise ConfigError(f'Option "{k}" has no defined default')
super().__setitem__(k, v)
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