


class     __a     :
 def __init__(  self							,					lowerCAmelCase__					)   ->							List[Any]:




        '''simple docstring'''
        lowercase__:  Any         =  data
        lowercase__:  Union[str, Any]         =  None
        lowercase__:  Any         =  None
 def __str__(  self					)   ->							Union[str, Any]:




        '''simple docstring'''
        return F'{self.data}'





class     __a     :
 def __init__(  self					)   ->							List[Any]:




        '''simple docstring'''
        lowercase__:  str         =  None
        lowercase__:  Any         =  None
 def __iter__(  self					)   ->							Any:




        '''simple docstring'''
        lowercase__:  Any         =  self.head
        while node:
               yield node.data
               lowercase__:  List[str]         =  node.next
 def __str__(  self					)   ->							List[str]:




        '''simple docstring'''
        return "->".join([str(lowerCAmelCase__					) for item in self]					)
 def __len__(  self					)   ->							str:




        '''simple docstring'''
        return sum(1 for _ in self					)
 def 						SCREAMING_SNAKE_CASE__  (  self							,					lowerCAmelCase__					)   ->							str:




        '''simple docstring'''
        self.insert_at_nth(0							,					lowerCAmelCase__					)
 def 						SCREAMING_SNAKE_CASE__  (  self							,					lowerCAmelCase__					)   ->							Union[str, Any]:




        '''simple docstring'''
        self.insert_at_nth(len(self					)							,					lowerCAmelCase__					)
 def 						SCREAMING_SNAKE_CASE__  (  self							,					lowerCAmelCase__							,					lowerCAmelCase__					)   ->							Any:




        '''simple docstring'''
        lowercase__:  Dict         =  len(self					)

        if not 0 <= index <= length:
               raise IndexError('list index out of range'					)
        lowercase__:  str         =  Node(lowerCAmelCase__					)
        if self.head is None:
               lowercase__:  List[Any]         =  new_node
        elif index == 0:
               lowercase__:  List[str]         =  new_node
               lowercase__:  Any         =  self.head
               lowercase__:  str         =  new_node
        elif index == length:
               lowercase__:  str         =  new_node
               lowercase__:  Optional[Any]         =  self.tail
               lowercase__:  int         =  new_node
        else:
               lowercase__:  Dict         =  self.head
               for _ in range(0							,					lowerCAmelCase__					):
                      lowercase__:  Optional[int]         =  temp.next
               lowercase__:  str         =  new_node
               lowercase__:  Union[str, Any]         =  temp.previous
               lowercase__:  List[str]         =  temp
               lowercase__:  Dict         =  new_node
 def 						SCREAMING_SNAKE_CASE__  (  self					)   ->							Union[str, Any]:




        '''simple docstring'''
        return self.delete_at_nth(0					)
 def 						SCREAMING_SNAKE_CASE__  (  self					)   ->							Union[str, Any]:




        '''simple docstring'''
        return self.delete_at_nth(len(self					) - 1					)
 def 						SCREAMING_SNAKE_CASE__  (  self							,					lowerCAmelCase__					)   ->							Optional[int]:




        '''simple docstring'''
        lowercase__:  str         =  len(self					)

        if not 0 <= index <= length - 1:
               raise IndexError('list index out of range'					)
        lowercase__:  int         =  self.head  # default first node
        if length == 1:
               lowercase__:  str         =  None
        elif index == 0:
               lowercase__:  List[Any]         =  self.head.next
               lowercase__:  str         =  None
        elif index == length - 1:
               lowercase__:  List[Any]         =  self.tail
               lowercase__:  Tuple         =  self.tail.previous
               lowercase__:  Any         =  None
        else:
               lowercase__:  Union[str, Any]         =  self.head
               for _ in range(0							,					lowerCAmelCase__					):
                      lowercase__:  Optional[int]         =  temp.next
               lowercase__:  Any         =  temp
               lowercase__:  Tuple         =  temp.previous
               lowercase__:  Optional[int]         =  temp.next
        return delete_node.data
 def 						SCREAMING_SNAKE_CASE__  (  self							,					lowerCAmelCase__					)   ->							str:




        '''simple docstring'''
        lowercase__:  Any         =  self.head

        while current.data != data:  # Find the position to delete
               if current.next:
                      lowercase__:  List[Any]         =  current.next
               else:  # We have reached the end an no value matches
                      raise ValueError('No data matching given value'					)

        if current == self.head:
               self.delete_head()

        elif current == self.tail:
               self.delete_tail()

        else:  # Before: 1 <--> 2(current) <--> 3
               lowercase__:  List[str]         =  current.next  # 1 --> 3
               lowercase__:  Dict         =  current.previous  # 1 <--> 3
        return data
 def 						SCREAMING_SNAKE_CASE__  (  self					)   ->							Optional[Any]:




        '''simple docstring'''
        return len(self					) == 0





def   snake_case_	(    )    ->							None:
       lowercase__:  Optional[int]         =  DoublyLinkedList()
       assert linked_list.is_empty() is True
       assert str(snake_case	) == ""

       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(10	):
              assert len(snake_case	) == i
              linked_list.insert_at_nth(snake_case     ,				i + 1	)
       assert str(snake_case	) == "->".join(str(snake_case	) for i in range(1     ,				11	)	)

       linked_list.insert_at_head(0	)
       linked_list.insert_at_tail(11	)
       assert str(snake_case	) == "->".join(str(snake_case	) for i in range(0     ,				12	)	)

       assert linked_list.delete_head() == 0
       assert linked_list.delete_at_nth(9	) == 10
       assert linked_list.delete_tail() == 11
       assert len(snake_case	) == 9
       assert str(snake_case	) == "->".join(str(snake_case	) for i in range(1     ,				10	)	)


if __name__ == "__main__":
 from doctest import testmod

 testmod()






class     __a     :
 def __init__(  self					)   ->							Tuple:




        '''simple docstring'''
        lowercase__:  str         =  []
        lowercase__:  Any         =  0
        lowercase__:  int         =  0
 def __str__(  self					)   ->							Any:




        '''simple docstring'''
        lowercase__:  str         =  '<' + str(self.entries					)[1:-1] + '>'
        return printed
 def 						SCREAMING_SNAKE_CASE__  (  self							,					lowerCAmelCase__					)   ->							List[str]:




        '''simple docstring'''
        self.entries.append(lowerCAmelCase__					)
        lowercase__:  List[str]         =  self.length + 1
 def 						SCREAMING_SNAKE_CASE__  (  self					)   ->							str:




        '''simple docstring'''
        lowercase__:  Any         =  self.length - 1
        lowercase__:  Optional[int]         =  self.entries[self.front]
        # self.front-=1
        # self.entries = self.entries[self.front:]
        lowercase__:  int         =  self.entries[1:]
        return dequeued
 def 						SCREAMING_SNAKE_CASE__  (  self							,					lowerCAmelCase__					)   ->							List[str]:




        '''simple docstring'''
        for _ in range(lowerCAmelCase__					):
               self.put(self.get()					)
 def 						SCREAMING_SNAKE_CASE__  (  self					)   ->							Union[str, Any]:




        '''simple docstring'''
        return self.entries[0]
 def 						SCREAMING_SNAKE_CASE__  (  self					)   ->							Optional[int]:




        '''simple docstring'''
        return self.length


