fe.py
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	import abc


	class Solver(metaclass=abc.ABCMeta):
	@abc.abstractmethod
	def solveStep(self):
	pass

	def _zero_rows(self, A, rows):
	for r in rows:
	diag = A[r, r]
	# zeros the lines defined in b
	A.data[A.indptr[r]:A.indptr[r + 1]] = 0.
	A[r, r] = diag


	class Model(metaclass=abc.ABCMeta):
	@abc.abstractmethod
	def applyDirichletBC(self):
	pass

	@abc.abstractmethod
	def f_int(self):
	pass

	@property
	@abc.abstractmethod
	def f_ext(self):
	pass

	@property
	@abc.abstractmethod
	def K(self):
	pass

	@property
	@abc.abstractmethod
	def M(self):
	pass

	@property
	@abc.abstractmethod
	def C(self):
	pass

	@property
	@abc.abstractmethod
	def blocked(self):
	pass