
from __future__ import annotations

from collections.abc import Iterator
from typing import Any






class        SCREAMING_SNAKE_CASE__    :

							"""simple docstring"""






							def __init__(  self     ,	SCREAMING_SNAKE_CASE_			)->   List[str]:





													'''simple docstring'''






													__UpperCamelCase       =			data
													__UpperCamelCase       =			None






class        SCREAMING_SNAKE_CASE__    :

							"""simple docstring"""






							def __init__(  self			)->   List[str]:





													'''simple docstring'''






													__UpperCamelCase       =			None
													__UpperCamelCase       =			None



							def __iter__(  self			)->   Iterator[Any]:





													'''simple docstring'''






													__UpperCamelCase       =			self.head
													while self.head:
																			yield node.data
																			__UpperCamelCase       =			node.next
																			if node == self.head:
																									break



							def __len__(  self			)->   int:





													'''simple docstring'''






													return sum(1 for _ in self			)



							def __repr__(  self			)->   Optional[Any]:





													'''simple docstring'''






													return "->".join(str(SCREAMING_SNAKE_CASE_			) for item in iter(self			)			)



							def     A__		(  self     ,	SCREAMING_SNAKE_CASE_			)->   None:





													'''simple docstring'''






													self.insert_nth(len(self			)     ,	SCREAMING_SNAKE_CASE_			)



							def     A__		(  self     ,	SCREAMING_SNAKE_CASE_			)->   None:





													'''simple docstring'''






													self.insert_nth(0     ,	SCREAMING_SNAKE_CASE_			)



							def     A__		(  self     ,	SCREAMING_SNAKE_CASE_     ,	SCREAMING_SNAKE_CASE_			)->   None:





													'''simple docstring'''






													if index < 0 or index > len(self			):
																			raise IndexError('''list index out of range.'''			)
													__UpperCamelCase       =			Node(SCREAMING_SNAKE_CASE_			)
													if self.head is None:
																			__UpperCamelCase       =			new_node  # first node points itself
																			__UpperCamelCase       =			__UpperCamelCase       =			new_node
													elif index == 0:  # insert at head
																			__UpperCamelCase       =			self.head
																			__UpperCamelCase       =			__UpperCamelCase       =			new_node
													else:
																			__UpperCamelCase       =			self.head
																			for _ in range(index - 1			):
																									__UpperCamelCase       =			temp.next
																			__UpperCamelCase       =			temp.next
																			__UpperCamelCase       =			new_node
																			if index == len(self			) - 1:  # insert at tail
																									__UpperCamelCase       =			new_node



							def     A__		(  self			)->   Any:





													'''simple docstring'''






													return self.delete_nth(0			)



							def     A__		(  self			)->   Any:





													'''simple docstring'''






													return self.delete_nth(len(self			) - 1			)



							def     A__		(  self     ,	SCREAMING_SNAKE_CASE_ = 0			)->   Any:





													'''simple docstring'''






													if not 0 <= index < len(self			):
																			raise IndexError('''list index out of range.'''			)
													__UpperCamelCase       =			self.head
													if self.head == self.tail:  # just one node
																			__UpperCamelCase       =			__UpperCamelCase       =			None
													elif index == 0:  # delete head node
																			__UpperCamelCase       =			self.tail.next.next
																			__UpperCamelCase       =			self.head.next
													else:
																			__UpperCamelCase       =			self.head
																			for _ in range(index - 1			):
																									__UpperCamelCase       =			temp.next
																			__UpperCamelCase       =			temp.next
																			__UpperCamelCase       =			temp.next.next
																			if index == len(self			) - 1:  # delete at tail
																									__UpperCamelCase       =			temp
													return delete_node.data



							def     A__		(  self			)->   bool:





													'''simple docstring'''






													return len(self			) == 0





def 	A_ (							)      ->    None:



						'''simple docstring'''

						__UpperCamelCase       =			CircularLinkedList()
						assert len(snake_case ) == 0
						assert circular_linked_list.is_empty() is True
						assert str(snake_case ) == ""

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

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

						try:
												circular_linked_list.delete_nth(-1 )
												raise AssertionError
						except IndexError:
												assert True

						try:
												circular_linked_list.delete_nth(0 )
												raise AssertionError
						except IndexError:
												assert True

						assert circular_linked_list.is_empty() is True
						for i in range(5 ):
												assert len(snake_case ) == i
												circular_linked_list.insert_nth(snake_case ,      i + 1 )
						assert str(snake_case ) == "->".join(str(snake_case ) for i in range(1 ,      6 ) )

						circular_linked_list.insert_tail(6 )
						assert str(snake_case ) == "->".join(str(snake_case ) for i in range(1 ,      7 ) )
						circular_linked_list.insert_head(0 )
						assert str(snake_case ) == "->".join(str(snake_case ) for i in range(0 ,      7 ) )

						assert circular_linked_list.delete_front() == 0
						assert circular_linked_list.delete_tail() == 6
						assert str(snake_case ) == "->".join(str(snake_case ) for i in range(1 ,      6 ) )
						assert circular_linked_list.delete_nth(2 ) == 3

						circular_linked_list.insert_nth(2 ,      3 )
						assert str(snake_case ) == "->".join(str(snake_case ) for i in range(1 ,      6 ) )

						assert circular_linked_list.is_empty() is False


if __name__ == "__main__":
				import doctest

				doctest.testmod()






# coding=utf-8
# Copyright 2023 The HuggingFace Inc. team.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
#     http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.

# this script dumps information about the environment

import os
import platform
import sys


lowercase__							:							List[str]									=			"3"

print("Python version:", sys.version)

print("OS platform:", platform.platform())
print("OS architecture:", platform.machine())

try:
				import torch

				print("Torch version:", torch.__version__)
				print("Cuda available:", torch.cuda.is_available())
				print("Cuda version:", torch.version.cuda)
				print("CuDNN version:", torch.backends.cudnn.version())
				print("Number of GPUs available:", torch.cuda.device_count())
except ImportError:
				print("Torch version:", None)

try:
				import transformers

				print("transformers version:", transformers.__version__)
except ImportError:
				print("transformers version:", None)




