
"""simple docstring"""


class 					A_			:



							"""simple docstring"""






							def __init__(						self						:Any  ,							lowerCamelCase_						:Union[str, Any] ):





										"""simple docstring"""

										lowerCamelCase__			:  List[str]  =data
										lowerCamelCase__			:  List[Any]  =None
										lowerCamelCase__			:  List[Any]  =None





							def __str__(						self						:Tuple ):





										"""simple docstring"""

										return f"""{self.data}"""






class 					A_			:



							"""simple docstring"""






							def __init__(						self						:Any ):





										"""simple docstring"""

										lowerCamelCase__			:  List[Any]  =None
										lowerCamelCase__			:  Any  =None





							def __iter__(						self						:Union[str, Any] ):





										"""simple docstring"""

										lowerCamelCase__			:  Any  =self.head
										while node:
													yield node.data
													lowerCamelCase__			:  Optional[Any]  =node.next





							def __str__(						self						:Dict ):





										"""simple docstring"""

										return "->".join([str(lowerCamelCase_ ) for item in self] )





							def __len__(						self						:int ):





										"""simple docstring"""

										return sum(1 for _ in self )





							def    UpperCAmelCase__							(						self						:str  ,							lowerCamelCase_						:str ):





										"""simple docstring"""

										self.insert_at_nth(0  ,							lowerCamelCase_ )





							def    UpperCAmelCase__							(						self						:Tuple  ,							lowerCamelCase_						:Dict ):





										"""simple docstring"""

										self.insert_at_nth(len(self )  ,							lowerCamelCase_ )





							def    UpperCAmelCase__							(						self						:Optional[Any]  ,							lowerCamelCase_						:int  ,							lowerCamelCase_						:Optional[Any] ):





										"""simple docstring"""

										lowerCamelCase__			:  List[Any]  =len(self )

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





							def    UpperCAmelCase__							(						self						:List[Any] ):





										"""simple docstring"""

										return self.delete_at_nth(0 )





							def    UpperCAmelCase__							(						self						:Union[str, Any] ):





										"""simple docstring"""

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





							def    UpperCAmelCase__							(						self						:List[str]  ,							lowerCamelCase_						:int ):





										"""simple docstring"""

										lowerCamelCase__			:  Optional[int]  =len(self )

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





							def    UpperCAmelCase__							(						self						:Optional[Any]  ,							lowerCamelCase_						:Any ):





										"""simple docstring"""

										lowerCamelCase__			:  Optional[int]  =self.head

										while current.data != data:  # Find the position to delete
													if current.next:
																lowerCamelCase__			:  Union[str, 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
													lowerCamelCase__			:  str  =current.next  # 1 --> 3
													lowerCamelCase__			:  Optional[Any]  =current.previous  # 1 <--> 3
										return data





							def    UpperCAmelCase__							(						self						:int ):





										"""simple docstring"""

										return len(self ) == 0






def      lowerCAmelCase_     (	)     ->None:
			lowerCamelCase__			:  Tuple  =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(1_0    ):
						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							,					1_1    )    )

			linked_list.insert_at_head(0    )
			linked_list.insert_at_tail(1_1    )
			assert str(snake_case_    ) == "->".join(str(snake_case_    ) for i in range(0							,					1_2    )    )

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


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

							testmod()

"""simple docstring"""


import unittest
import warnings

from datasets.utils import experimental






@experimental
def      lowerCAmelCase_     (	)     ->Optional[Any]:
			return "success"

class 					A_			(  unittest.TestCase     ):



							"""simple docstring"""






							def    UpperCAmelCase__							(						self						:int ):





										"""simple docstring"""

										with warnings.catch_warnings(record=lowerCamelCase_ ) as w:
													warnings.simplefilter('always' )
													self.assertEqual(dummy_function()  ,							'success' )
										self.assertEqual(len(lowerCamelCase_ )  ,							1 )