Refactoring code

pina/problem/__init__.py

@@ -0,0 +1,4 @@
+from .abstract_problem import AbstractProblem
+from .problem2d import Problem2D
+from .problem1d import Problem1D
+from .timedep_problem import TimeDependentProblem

pina/problem/abstract_problem.py

@@ -0,0 +1,19 @@
+from abc import ABCMeta, abstractmethod
+
+
+class AbstractProblem(metaclass=ABCMeta):
+
+    @property
+    @abstractmethod
+    def input_variables(self):
+        pass
+
+    @property
+    @abstractmethod
+    def output_variables(self):
+        pass
+
+    @property
+    @abstractmethod
+    def conditions(self):
+        pass

pina/problem/problem1d.py

@@ -0,0 +1,6 @@
+from .abstract_problem import AbstractProblem
+
+
+class Problem1D(AbstractProblem):
+
+    spatial_dimensions = 1

pina/problem/problem2d.py

@@ -0,0 +1,6 @@
+from .abstract_problem import AbstractProblem
+
+
+class Problem2D(AbstractProblem):
+
+    spatial_dimensions = 2

pina/problem/timedep_problem.py

@@ -0,0 +1,6 @@
+from .abstract_problem import AbstractProblem
+
+
+class TimeDependentProblem(AbstractProblem):
+
+    pass