root = Tree('Root')
        child01 = Tree('C01')
        child02 = Tree('C02')
        child03 = Tree('C03')
        child11 = Tree('C11')
        child31 = Tree('C31')
        child111 = Tree('C111')
        child112 = Tree('C112')
        #add children nodes
        root.addChildren([child01, child02, child03]) 
        child01.addChild(child11)
        child03.addChild(child31)
        child11.addChild(child111)
        child11.addChild(child112)
        
        #to print hierarchy tree structure
        root.prettyTree()
        #to print nested-list tree structure
        #root.nestedTree()

	   	Root
         |___ C01
         |     |___ C11
         |          |___ C111
         |          |___ C112
         |___ C02
         |___ C03
         |     |___ C31

	child31 = Tree('C31')
 	child03 = Tree('C03', child31 )

	child01 = Tree('C01')
	child02 = Tree('C02')
	child03 = Tree('C03')
	root = Tree('Root', [child01, child02, child03] )

	Methods
		|___ addChild
		|___ addChildren
		|___ getParent
		|___ getChild
		|___ getChildren
		|___ getNode
		|___ delChild
		|___ delNode
		|___ getRoot
		|___ isRoot
		|___ isBranch
		|___ prettyTree
		|___ nestedTree