

class 			snake_case_     :







			'''simple docstring'''

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







			def __str__(  self				:       Tuple							)   ->Optional[Any]:
									return f'''{self.data}'''






class 			snake_case_     :







			'''simple docstring'''

			def __init__(  self				:       Optional[Any]							)   ->Optional[int]:
									snake_case_     =			None
									snake_case_     =			None







			def __iter__(  self				:       Union[str, Any]							)   ->List[Any]:
									snake_case_     =			self.head
									while node:
															yield node.data
															snake_case_     =			node.next







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







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







			def        snake_case__(  self				:       Tuple							,     _UpperCamelCase				:       List[str]							)   ->List[Any]:
									self.insert_at_nth(0							,     _UpperCamelCase							)







			def        snake_case__(  self				:       int							,     _UpperCamelCase				:       int							)   ->Any:
									self.insert_at_nth(len(self							)							,     _UpperCamelCase							)







			def        snake_case__(  self				:       Tuple							,     _UpperCamelCase				:       int							,     _UpperCamelCase				:       Tuple							)   ->Any:
									snake_case_     =			len(self							)

									if not 0 <= index <= length:
															raise IndexError('''list index out of range'''							)
									snake_case_     =			Node(_UpperCamelCase							)
									if self.head is None:
															snake_case_     =			snake_case_     =			new_node
									elif index == 0:
															snake_case_     =			new_node
															snake_case_     =			self.head
															snake_case_     =			new_node
									elif index == length:
															snake_case_     =			new_node
															snake_case_     =			self.tail
															snake_case_     =			new_node
									else:
															snake_case_     =			self.head
															for _ in range(0							,     _UpperCamelCase							):
																					snake_case_     =			temp.next
															snake_case_     =			new_node
															snake_case_     =			temp.previous
															snake_case_     =			temp
															snake_case_     =			new_node







			def        snake_case__(  self				:       Any							)   ->Dict:
									return self.delete_at_nth(0							)







			def        snake_case__(  self				:       int							)   ->Any:
									return self.delete_at_nth(len(self							) - 1							)







			def        snake_case__(  self				:       int							,     _UpperCamelCase				:       int							)   ->int:
									snake_case_     =			len(self							)

									if not 0 <= index <= length - 1:
															raise IndexError('''list index out of range'''							)
									snake_case_     =			self.head  # default first node
									if length == 1:
															snake_case_     =			snake_case_     =			None
									elif index == 0:
															snake_case_     =			self.head.next
															snake_case_     =			None
									elif index == length - 1:
															snake_case_     =			self.tail
															snake_case_     =			self.tail.previous
															snake_case_     =			None
									else:
															snake_case_     =			self.head
															for _ in range(0							,     _UpperCamelCase							):
																					snake_case_     =			temp.next
															snake_case_     =			temp
															snake_case_     =			temp.previous
															snake_case_     =			temp.next
									return delete_node.data







			def        snake_case__(  self				:       Any							,     _UpperCamelCase				:       Any							)   ->str:
									snake_case_     =			self.head

									while current.data != data:  # Find the position to delete
															if current.next:
																					snake_case_     =			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
															snake_case_     =			current.next  # 1 --> 3
															snake_case_     =			current.previous  # 1 <--> 3
									return data







			def        snake_case__(  self				:       Optional[int]							)   ->Optional[Any]:
									return len(self							) == 0






def 						__SCREAMING_SNAKE_CASE      ():
						snake_case_     =			DoublyLinkedList()
						assert linked_list.is_empty() is True
						assert str(SCREAMING_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(SCREAMING_SNAKE_CASE__ ) == i
												linked_list.insert_at_nth(SCREAMING_SNAKE_CASE__						,	i + 1 )
						assert str(SCREAMING_SNAKE_CASE__ ) == "->".join(str(SCREAMING_SNAKE_CASE__ ) for i in range(1						,	11 ) )

						linked_list.insert_at_head(0 )
						linked_list.insert_at_tail(11 )
						assert str(SCREAMING_SNAKE_CASE__ ) == "->".join(str(SCREAMING_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(SCREAMING_SNAKE_CASE__ ) == 9
						assert str(SCREAMING_SNAKE_CASE__ ) == "->".join(str(SCREAMING_SNAKE_CASE__ ) for i in range(1						,	10 ) )


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

					testmod()


import warnings

from .generation import GenerationMixin





class 			snake_case_     (	__A      ):







			'''simple docstring'''

			warnings.warn(
			    "Importing `GenerationMixin` from `src/transformers/generation_utils.py` is deprecated and will "
			    "be removed in Transformers v5. Import as `from transformers import GenerationMixin` instead."			, __A			, )