


'''simple docstring'''



from __future__ import annotations

from collections.abc import Iterator
from typing import Any


class 						_snake_case   :




					def __init__( self							,							_lowerCamelCase):
								UpperCAmelCase__					:   Any       				=       data
								UpperCAmelCase__					:   Node | None       				=       None


class 						_snake_case   :




					def __init__( self):
								UpperCAmelCase__					:   Optional[Any]       				=       None
								UpperCAmelCase__					:   Any       				=       None




					def __iter__( self):
								UpperCAmelCase__					:   Optional[int]       				=       self.head
								while self.head:
											yield node.data
											UpperCAmelCase__					:   Optional[int]       				=       node.next
											if node == self.head:
														break




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




					def __repr__( self):
								return "->".join(str(_lowerCamelCase) for item in iter(self))




					def 			snake_case__  ( self							,							_lowerCamelCase):
								self.insert_nth(len(self)							,							_lowerCamelCase)




					def 			snake_case__  ( self							,							_lowerCamelCase):
								self.insert_nth(0							,							_lowerCamelCase)




					def 			snake_case__  ( self							,							_lowerCamelCase							,							_lowerCamelCase):
								if index < 0 or index > len(self):
											raise IndexError("""list index out of range.""")
								UpperCAmelCase__					:   int       				=       Node(_lowerCamelCase)
								if self.head is None:
											UpperCAmelCase__					:   Optional[int]       				=       new_node  # first node points itself
											UpperCAmelCase__					:   Optional[Any]       				=       new_node
								elif index == 0:  # insert at head
											UpperCAmelCase__					:   List[Any]       				=       self.head
											UpperCAmelCase__					:   Optional[Any]       				=       new_node
								else:
											UpperCAmelCase__					:   List[Any]       				=       self.head
											for _ in range(index - 1):
														UpperCAmelCase__					:   List[Any]       				=       temp.next
											UpperCAmelCase__					:   Tuple       				=       temp.next
											UpperCAmelCase__					:   int       				=       new_node
											if index == len(self) - 1:  # insert at tail
														UpperCAmelCase__					:   Dict       				=       new_node




					def 			snake_case__  ( self):
								return self.delete_nth(0)




					def 			snake_case__  ( self):
								return self.delete_nth(len(self) - 1)




					def 			snake_case__  ( self							,							_lowerCamelCase = 0):
								if not 0 <= index < len(self):
											raise IndexError("""list index out of range.""")
								UpperCAmelCase__					:   Optional[int]       				=       self.head
								if self.head == self.tail:  # just one node
											UpperCAmelCase__					:   List[Any]       				=       None
								elif index == 0:  # delete head node
											UpperCAmelCase__					:   List[Any]       				=       self.tail.next.next
											UpperCAmelCase__					:   Tuple       				=       self.head.next
								else:
											UpperCAmelCase__					:   List[str]       				=       self.head
											for _ in range(index - 1):
														UpperCAmelCase__					:   int       				=       temp.next
											UpperCAmelCase__					:   Union[str, Any]       				=       temp.next
											UpperCAmelCase__					:   Dict       				=       temp.next.next
											if index == len(self) - 1:  # delete at tail
														UpperCAmelCase__					:   Any       				=       temp
								return delete_node.data




					def 			snake_case__  ( self):
								return len(self) == 0







def       _UpperCamelCase (						):
			UpperCAmelCase__					:   Optional[int]       				=       CircularLinkedList()
			assert len(UpperCamelCase__   ) == 0
			assert circular_linked_list.is_empty() is True
			assert str(UpperCamelCase__   ) == ""

			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(UpperCamelCase__   ) == i
						circular_linked_list.insert_nth(UpperCamelCase__	, i + 1   )
			assert str(UpperCamelCase__   ) == "->".join(str(UpperCamelCase__   ) for i in range(1	, 6   )   )

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

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

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

			assert circular_linked_list.is_empty() is False


if __name__ == "__main__":
		import doctest

		doctest.testmod()



'''simple docstring'''



from typing import TYPE_CHECKING

from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_tokenizers_available, is_torch_available


__A		={
    'configuration_m2m_100': ['M2M_100_PRETRAINED_CONFIG_ARCHIVE_MAP', 'M2M100Config', 'M2M100OnnxConfig'],
    'tokenization_m2m_100': ['M2M100Tokenizer'],
}


try:
		if not is_torch_available():
				raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
		pass
else:
		__A		=[
		    'M2M_100_PRETRAINED_MODEL_ARCHIVE_LIST',
		    'M2M100ForConditionalGeneration',
		    'M2M100Model',
		    'M2M100PreTrainedModel',
		]


if TYPE_CHECKING:
		from .configuration_mam_aaa import M2M_100_PRETRAINED_CONFIG_ARCHIVE_MAP, MaMaaaConfig, MaMaaaOnnxConfig
		from .tokenization_mam_aaa import MaMaaaTokenizer

		try:
				if not is_torch_available():
						raise OptionalDependencyNotAvailable()
		except OptionalDependencyNotAvailable:
				pass
		else:
				from .modeling_mam_aaa import (
				    M2M_100_PRETRAINED_MODEL_ARCHIVE_LIST,
				    MaMaaaForConditionalGeneration,
				    MaMaaaModel,
				    MaMaaaPreTrainedModel,
				)


else:
		import sys

		__A		=_LazyModule(__name__, globals()['__file__'], _import_structure, module_spec=__spec__)