Create ast package

smnp/ast/node/colon.py

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