add if __name__ == "__main__" to prevent script from running on import

src/machine_learning/decision_tree.py

@@ -69,7 +69,7 @@ def get_decision(data: dict, root: Node) -> str:
     return root.name
 
 
-tree_root = tree_learn(training_set, attribs, 'detonation')
+def main():
     print(RenderTree(tree_root))
     print('-' * 150)
 
@@ -82,3 +82,10 @@ for test in test_set:
             score += 1
 
     print(f'Accuracy: {score/len(test_set)}')
+
+
+tree_root = tree_learn(training_set, attribs, 'detonation')
+
+
+if __name__ == "__main__":
+    main()