
'''simple docstring'''





class 			UpperCamelCase__	:






 def __init__(      self	:Optional[Any]						,					_A	:Tuple      )					->      Tuple:







       '''simple docstring'''



       __A													=      data
       __A													=      None
       __A													=      None






 def __str__(      self	:List[str]      )					->      Optional[int]:







       '''simple docstring'''



       return F'{self.data}'


class 			UpperCamelCase__	:






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







       '''simple docstring'''



       __A													=      None
       __A													=      None






 def __iter__(      self	:Optional[int]      )					->      List[Any]:







       '''simple docstring'''



       __A													=      self.head
       while node:
             yield node.data
             __A													=      node.next






 def __str__(      self	:Dict      )					->      Union[str, Any]:







       '''simple docstring'''



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






 def __len__(      self	:int      )					->      List[str]:







       '''simple docstring'''



       return sum(1 for _ in self      )






 def 						lowercase_    (      self	:List[str]						,					_A	:Any      )					->      str:







       '''simple docstring'''



       self.insert_at_nth(0						,					_A      )






 def 						lowercase_    (      self	:Dict						,					_A	:Optional[Any]      )					->      Tuple:







       '''simple docstring'''



       self.insert_at_nth(len(self      )						,					_A      )






 def 						lowercase_    (      self	:Optional[int]						,					_A	:int						,					_A	:Optional[int]      )					->      int:







       '''simple docstring'''



       __A													=      len(self      )

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






 def 						lowercase_    (      self	:Optional[int]      )					->      List[str]:







       '''simple docstring'''



       return self.delete_at_nth(0      )






 def 						lowercase_    (      self	:Any      )					->      Tuple:







       '''simple docstring'''



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






 def 						lowercase_    (      self	:Dict						,					_A	:int      )					->      List[str]:







       '''simple docstring'''



       __A													=      len(self      )

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






 def 						lowercase_    (      self	:List[str]						,					_A	:Dict      )					->      str:







       '''simple docstring'''



       __A													=      self.head

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






 def 						lowercase_    (      self	:List[str]      )					->      Tuple:







       '''simple docstring'''



       return len(self      ) == 0





def 							snake_case				(		)->      None:







      """simple docstring"""
      __A													=      DoublyLinkedList()
      assert linked_list.is_empty() is True
      assert str(UpperCAmelCase						) == ""

      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(UpperCAmelCase						) == i
            linked_list.insert_at_nth(UpperCAmelCase   ,	i + 1						)
      assert str(UpperCAmelCase						) == "->".join(str(UpperCAmelCase						) for i in range(1   ,	1_1						)						)

      linked_list.insert_at_head(0						)
      linked_list.insert_at_tail(1_1						)
      assert str(UpperCAmelCase						) == "->".join(str(UpperCAmelCase						) 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(UpperCAmelCase						) == 9
      assert str(UpperCAmelCase						) == "->".join(str(UpperCAmelCase						) for i in range(1   ,	1_0						)						)


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

 testmod()








'''simple docstring'''





import os
import unittest

import pytest
from parameterized import parameterized

from transformers.testing_utils import require_torch, require_torch_gpu, slow, torch_device


# skipping in unittest tests

a__		: Tuple  							=							[(1,)]





def 							snake_case				(		)->      Union[str, Any]:







      """simple docstring"""
      __A													=      bool(os.getenv('RUN_SLOW'   ,	0						)						)
      if run_slow:
            assert True
      else:
            assert False, "should have been skipped"





def 							snake_case				(		)->      Tuple:







      """simple docstring"""
      __A													=      bool(os.getenv('RUN_SLOW'   ,	0						)						)
      if run_slow and torch_device == "cuda":
            assert True
      else:
            assert False, "should have been skipped"


@require_torch
class 			UpperCamelCase__	(     unittest.TestCase):






 @slow
 @require_torch_gpu
 def 						lowercase_    (      self	:Dict      )					->      List[Any]:







       '''simple docstring'''



       check_slow_torch_cuda()






 @require_torch_gpu
 @slow
 def 						lowercase_    (      self	:int      )					->      int:







       '''simple docstring'''



       check_slow_torch_cuda()






 @parameterized.expand(_A      )
 @slow
 def 						lowercase_    (      self	:Dict						,					_A	:Union[str, Any]=None      )					->      Dict:







       '''simple docstring'''



       check_slow()





@slow
@require_torch_gpu
def 							snake_case				(		)->      Optional[int]:







      """simple docstring"""
      check_slow_torch_cuda()





@require_torch_gpu
@slow
def 							snake_case				(		)->      List[str]:







      """simple docstring"""
      check_slow_torch_cuda()





@slow
@pytest.mark.parametrize('param'   ,	[1]						)
def 							snake_case				(		UpperCAmelCase						)->      int:







      """simple docstring"""
      check_slow()





@pytest.mark.parametrize('param'   ,	[1]						)
@slow
def 							snake_case				(		UpperCAmelCase						)->      Any:







      """simple docstring"""
      check_slow()






