purge_dict.py
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	#!/usr/bin/python
	# Copyright (C) 2018 by the RROMPy authors
	#
	# This file is part of RROMPy.
	#
	# RROMPy is free software: you can redistribute it and/or modify
	# it under the terms of the GNU Lesser General Public License as published by
	# the Free Software Foundation, either version 3 of the License, or
	# (at your option) any later version.
	#
	# RROMPy 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 Lesser General Public License for more details.
	#
	# You should have received a copy of the GNU Lesser General Public License
	# along with RROMPy. If not, see <http://www.gnu.org/licenses/>.
	#

	import warnings
	from rrompy.utilities.find_dict_str_key import findDictStrKey
	from rrompy.utilities.types import ListAny, DictAny

	__all__ = ['purgeDict']

	def purgeDict(dct:DictAny, allowedKeys : ListAny = [], silent : bool = False,
	complement : bool = False, dictname : str = ""):
	if dictname != "":
	dictname = " in " + dictname
	dctcp = {}
	for key in dct.keys():
	akey = findDictStrKey(key, allowedKeys)
	if (akey is None) != complement:
	if not silent:
	warnings.warn("Ignoring key {0}{2} with value {1}."\
	.format(key, dct[key], dictname), stacklevel = 2)
	else:
	if akey is None:
	akey = key
	dctcp[akey] = dct[key]
	return dctcp