


'''simple docstring'''
from typing import Any






class        lowerCAmelCase_  :






       def __init__( self			,     _UpperCamelCase   )->      Union[str, Any]:
            _A				=							data
            _A				=							None






       def __repr__( self   )->      str:
            return F'Node({self.data})'






class        lowerCAmelCase_  :






       def __init__( self   )->      Union[str, Any]:
            _A				=							None






       def __iter__( self   )->      Any:
            _A				=							self.head
            while node:
                 yield node.data
                 _A				=							node.next






       def __len__( self   )->      int:
            return sum(1 for _ in self   )






       def __repr__( self   )->      str:
            return "->".join([str(_UpperCamelCase   ) for item in self]   )






       def __getitem__( self			,     _UpperCamelCase   )->      Any:
            if not 0 <= index < len(self   ):
                 raise ValueError('list index out of range.'   )
            for i, node in enumerate(self   ):
                 if i == index:
                      return node
            return None






       def __setitem__( self			,     _UpperCamelCase			,     _UpperCamelCase   )->      None:
            if not 0 <= index < len(self   ):
                 raise ValueError('list index out of range.'   )
            _A				=							self.head
            for _ in range(_UpperCamelCase   ):
                 _A				=							current.next
            _A				=							data






       def   UpperCamelCase						( self			,     _UpperCamelCase   )->      None:
            self.insert_nth(len(self   )			,     _UpperCamelCase   )






       def   UpperCamelCase						( self			,     _UpperCamelCase   )->      None:
            self.insert_nth(0			,     _UpperCamelCase   )






       def   UpperCamelCase						( self			,     _UpperCamelCase			,     _UpperCamelCase   )->      None:
            if not 0 <= index <= len(self   ):
                 raise IndexError('list index out of range'   )
            _A				=							Node(_UpperCamelCase   )
            if self.head is None:
                 _A				=							new_node
            elif index == 0:
                 _A				=							self.head  # link new_node to head
                 _A				=							new_node
            else:
                 _A				=							self.head
                 for _ in range(index - 1   ):
                      _A				=							temp.next
                 _A				=							temp.next
                 _A				=							new_node






       def   UpperCamelCase						( self   )->      None:  # print every node data
            print(self   )






       def   UpperCamelCase						( self   )->      Any:
            return self.delete_nth(0   )






       def   UpperCamelCase						( self   )->      Any:  # delete from tail
            return self.delete_nth(len(self   ) - 1   )






       def   UpperCamelCase						( self			,     _UpperCamelCase = 0   )->      Any:
            if not 0 <= index <= len(self   ) - 1:  # test if index is valid
                 raise IndexError('List index out of range.'   )
            _A				=							self.head  # default first node
            if index == 0:
                 _A				=							self.head.next
            else:
                 _A				=							self.head
                 for _ in range(index - 1   ):
                      _A				=							temp.next
                 _A				=							temp.next
                 _A				=							temp.next.next
            return delete_node.data






       def   UpperCamelCase						( self   )->      bool:
            return self.head is None






       def   UpperCamelCase						( self   )->      None:
            _A				=							None
            _A				=							self.head

            while current:
                 # Store the current node's next node.
                 _A				=							current.next
                 # Make the current node's next point backwards
                 _A				=							prev
                 # Make the previous node be the current node
                 _A				=							current
                 # Make the current node the next node (to progress iteration)
                 _A				=							next_node
            # Return prev in order to put the head at the end
            _A				=							prev






def 					lowerCamelCase_ ( )					->	None:







     """simple docstring"""
     _A				=							LinkedList()
     assert linked_list.is_empty() is True
     assert str(__UpperCamelCase		) == ""

     try:
          linked_list.delete_head()
          raise AssertionError  # This should not happen.
     except IndexError:
          assert True  # This should happen.

     try:
          linked_list.delete_tail()
          raise AssertionError  # This should not happen.
     except IndexError:
          assert True  # This should happen.

     for i in range(1_0		):
          assert len(__UpperCamelCase		) == i
          linked_list.insert_nth(__UpperCamelCase							,    i + 1		)
     assert str(__UpperCamelCase		) == "->".join(str(__UpperCamelCase		) for i in range(1							,    1_1		)		)

     linked_list.insert_head(0		)
     linked_list.insert_tail(1_1		)
     assert str(__UpperCamelCase		) == "->".join(str(__UpperCamelCase		) for i in range(0							,    1_2		)		)

     assert linked_list.delete_head() == 0
     assert linked_list.delete_nth(9		) == 1_0
     assert linked_list.delete_tail() == 1_1
     assert len(__UpperCamelCase		) == 9
     assert str(__UpperCamelCase		) == "->".join(str(__UpperCamelCase		) for i in range(1							,    1_0		)		)

     assert all(linked_list[i] == i + 1 for i in range(0							,    9		)		) is True

     for i in range(0							,    9		):
          _A				=							-i
     assert all(linked_list[i] == -i for i in range(0							,    9		)		) is True

     linked_list.reverse()
     assert str(__UpperCamelCase		) == "->".join(str(__UpperCamelCase		) for i in range(-8							,    1		)		)

def 					lowerCamelCase_ ( )					->	None:







     """simple docstring"""
     _A				=							[
         -9,
         1_0_0,
         Node(7_7_3_4_5_1_1_2		),
         'dlrow olleH',
         7,
         5_5_5_5,
         0,
         -1_92.5_55_55,
         'Hello, world!',
         77.9,
         Node(1_0		),
         None,
         None,
         12.20,
     ]
     _A				=							LinkedList()

     for i in test_input:
          linked_list.insert_tail(__UpperCamelCase		)

     # Check if it's empty or not
     assert linked_list.is_empty() is False
     assert (
         str(__UpperCamelCase		) == "-9->100->Node(77345112)->dlrow olleH->7->5555->0->"
         "-192.55555->Hello, world!->77.9->Node(10)->None->None->12.2"
     )

     # Delete the head
     _A				=							linked_list.delete_head()
     assert result == -9
     assert (
         str(__UpperCamelCase		) == "100->Node(77345112)->dlrow olleH->7->5555->0->-192.55555->"
         "Hello, world!->77.9->Node(10)->None->None->12.2"
     )

     # Delete the tail
     _A				=							linked_list.delete_tail()
     assert result == 12.2
     assert (
         str(__UpperCamelCase		) == "100->Node(77345112)->dlrow olleH->7->5555->0->-192.55555->"
         "Hello, world!->77.9->Node(10)->None->None"
     )

     # Delete a node in specific location in linked list
     _A				=							linked_list.delete_nth(1_0		)
     assert result is None
     assert (
         str(__UpperCamelCase		) == "100->Node(77345112)->dlrow olleH->7->5555->0->-192.55555->"
         "Hello, world!->77.9->Node(10)->None"
     )

     # Add a Node instance to its head
     linked_list.insert_head(Node('Hello again, world!'		)		)
     assert (
         str(__UpperCamelCase		)
         == "Node(Hello again, world!)->100->Node(77345112)->dlrow olleH->"
         "7->5555->0->-192.55555->Hello, world!->77.9->Node(10)->None"
     )

     # Add None to its tail
     linked_list.insert_tail(__UpperCamelCase		)
     assert (
         str(__UpperCamelCase		)
         == "Node(Hello again, world!)->100->Node(77345112)->dlrow olleH->"
         "7->5555->0->-192.55555->Hello, world!->77.9->Node(10)->None->None"
     )

     # Reverse the linked list
     linked_list.reverse()
     assert (
         str(__UpperCamelCase		)
         == "None->None->Node(10)->77.9->Hello, world!->-192.55555->0->5555->"
         "7->dlrow olleH->Node(77345112)->100->Node(Hello again, world!)"
     )

def 					lowerCamelCase_ ( )					->	Dict:







     """simple docstring"""
     from doctest import testmod

     testmod()

     _A				=							LinkedList()
     linked_list.insert_head(input('Inserting 1st at head '		).strip()		)
     linked_list.insert_head(input('Inserting 2nd at head '		).strip()		)
     print('\nPrint list:'		)
     linked_list.print_list()
     linked_list.insert_tail(input('\nInserting 1st at tail '		).strip()		)
     linked_list.insert_tail(input('Inserting 2nd at tail '		).strip()		)
     print('\nPrint list:'		)
     linked_list.print_list()
     print('\nDelete head'		)
     linked_list.delete_head()
     print('Delete tail'		)
     linked_list.delete_tail()
     print('\nPrint list:'		)
     linked_list.print_list()
     print('\nReverse linked list'		)
     linked_list.reverse()
     print('\nPrint list:'		)
     linked_list.print_list()
     print('\nString representation of linked list:'		)
     print(__UpperCamelCase		)
     print('\nReading/changing Node data using indexing:'		)
     print(F'Element at Position 1: {linked_list[1]}'		)
     _A				=							input('Enter New Value: '		).strip()
     print('New list:'		)
     print(__UpperCamelCase		)
     print(F'length of linked_list is : {len(__UpperCamelCase		)}'		)


if __name__ == "__main__":
    main()









'''simple docstring'''
def 					lowerCamelCase_ ( __UpperCamelCase					:       list							,    __UpperCamelCase					:       int							,    __UpperCamelCase					:       int = 0							,    __UpperCamelCase					:       int = 0		)					->	int:







     """simple docstring"""
     _A				=							right or len(__UpperCamelCase		) - 1
     if left > right:
          return -1
     elif list_data[left] == key:
          return left
     elif list_data[right] == key:
          return right
     else:
          return search(__UpperCamelCase							,    __UpperCamelCase							,    left + 1							,    right - 1		)


if __name__ == "__main__":
    import doctest

    doctest.testmod()





