expression.py
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	# Copyright (C) 2018-2020 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/>.
	#

	from rrompy.utilities.base.types import ListAny
	from rrompy.utilities.exception_manager import RROMPyException

	__all__ = ["Expression"]

	class Expression:
	"Utility class for list of tuples."
	def __init__(self, expr:ListAny):
	self.expr = expr

	def __str__(self):
	return str(self[0])

	def __repr__(self):
	return repr(self[0])

	def __len__(self):
	return len(self.expr)

	def __getitem__(self, key):
	if key < len(self): return self.expr[key]
	if self[-1] is None: return None
	raise RROMPyException(("Non enough derivatives available."))