/usr/lib/python2.7/dist-packages/ufl/equation.py is in python-ufl 1.3.0-1.
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# Copyright (C) 2012 Anders Logg and Martin Sandve Alnes
#
# This file is part of UFL.
#
# UFL 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.
#
# UFL 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 UFL. If not, see <http://www.gnu.org/licenses/>.
#
# First added: 2011-06-21
# Last changed: 2011-06-22
class Equation:
"""This class is used to represent equations expressed by the "=="
operator. Examples include a == L and F == 0 where a, L and F are
Form objects."""
def __init__(self, lhs, rhs):
"Create equation lhs == rhs"
self.lhs = lhs
self.rhs = rhs
def __nonzero__(self):
return type(self.lhs) == type(self.rhs) and \
repr(self.lhs) == repr(self.rhs) # REPR not a problem
def __eq__(self, other):
return isinstance(other, Equation) and \
bool(self.lhs == other.lhs) and \
bool(self.rhs == other.rhs)
def __repr__(self):
return "Equation(%r, %r)" % (self.lhs, self.rhs)
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