Create ast package

smnp/ast/node/assignment.py

@@ -0,0 +1,10 @@
+from smnp.ast.node.model import Node
+
+
+class AssignmentNode(Node):
+    def __init__(self, target, value, parent, pos):
+        Node.__init__(self, parent, pos)
+        self.children.extend([target, value])
+
+        self.target = self.children[0]
+        self.value = self.children[1]