Create ListViewUsingTree.py (#7)

Add an n-ary tree to construct list view

Author: parameswaran-natarajan

Trees/ListViewUsingTree.py

@@ -0,0 +1,67 @@
+# Author: Parameswaran
+
+# sample object
+class Sample:
+    def __init__(self, data_description, node_id, parent_id=""):
+        self.data_description = data_description
+        self.node_id = node_id
+        self.parent_id = parent_id
+
+
+# Node structure (Basically N-ary Tree)
+class Node:
+    def __init__(self, data):
+        self.data = Sample(data['data_description'], data['node_id'], data['parent_id'])
+        self.children = []
+
+
+class Tree:
+    def __init__(self, data):
+        self.Root = data
+
+    def insert_child(self, root, new_node):
+
+        #  if the list item's parent_id is equal to the current node it will append the node in their child array.
+
+        if root.data.node_id == new_node.data.parent_id:
+            root.children.append(new_node)
+
+        # else it will check all the node and their children list whether the parent_id is same.
+
+        elif len(root.children) > 0:
+            for each_child in root.children:
+                # it will create a recursive call for all nodes to treate as a root and search for all its child_list nodes
+                self.insert_child(each_child, new_node)
+
+    def print_tree(self, root, point):
+        print(point, root.data.node_id, root.data.parent_id, root.data.data_description)
+        if len(root.children) > 0:
+            point += "_"
+            for each_child in root.children:
+                self.print_tree(each_child, point)
+
+
+data = {'data_description': 'Sample_root_1', 'node_id': '1', 'parent_id': ''}
+data1 = {'data_description': 'Sample_root_2', 'node_id': '2', 'parent_id': '1'}
+data2 = {'data_description': 'Sample_root_3', 'node_id': '3', 'parent_id': '1'}
+data3 = {'data_description': 'Sample_root_4', 'node_id': '4', 'parent_id': '2'}
+data4 = {'data_description': 'Sample_root_5', 'node_id': '5', 'parent_id': '3'}
+data5 = {'data_description': 'Sample_root_6', 'node_id': '6', 'parent_id': '4'}
+data6 = {'data_description': 'Sample_root_7', 'node_id': '7', 'parent_id': '4'}
+
+a = Tree(Node(data))
+a.insert_child(a.Root, Node(data1))
+a.insert_child(a.Root, Node(data2))
+a.insert_child(a.Root, Node(data3))
+a.insert_child(a.Root, Node(data4))
+a.insert_child(a.Root, Node(data5))
+a.insert_child(a.Root, Node(data6))
+a.print_tree(a.Root, "|_")
+
+# |_ 1  Sample_root_1
+# |__ 2 1 Sample_root_2
+# |___ 4 2 Sample_root_4
+# |____ 6 4 Sample_root_6
+# |____ 7 4 Sample_root_7
+# |__ 3 1 Sample_root_3
+# |___ 5 3 Sample_root_5