




from __future__ import annotations

from collections.abc import Iterator
from typing import Any





class 			lowerCamelCase_				:


 '''simple docstring'''







 def __init__(				self    :						int							,							_lowerCAmelCase    :						Any		):
       SCREAMING_SNAKE_CASE_      		=     data
       SCREAMING_SNAKE_CASE_      		=     None





class 			lowerCamelCase_				:


 '''simple docstring'''







 def __init__(				self    :						Any		):
       SCREAMING_SNAKE_CASE_      		=     None
       SCREAMING_SNAKE_CASE_      		=     None



 def __iter__(				self    :						int		):
       SCREAMING_SNAKE_CASE_      		=     self.head
       while self.head:
             yield node.data
             SCREAMING_SNAKE_CASE_      		=     node.next
             if node == self.head:
                   break



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



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



 def  lowerCAmelCase_    (				self    :						List[Any]							,							_lowerCAmelCase    :						Any		):
       self.insert_nth(len(self		)							,							__snake_case		)



 def  lowerCAmelCase_    (				self    :						List[Any]							,							_lowerCAmelCase    :						Any		):
       self.insert_nth(0							,							__snake_case		)



 def  lowerCAmelCase_    (				self    :						Union[str, Any]							,							_lowerCAmelCase    :						int							,							_lowerCAmelCase    :						Any		):
       if index < 0 or index > len(self		):
             raise IndexError('list index out of range.'		)
       SCREAMING_SNAKE_CASE_      		=     Node(__snake_case		)
       if self.head is None:
             SCREAMING_SNAKE_CASE_      		=     new_node  # first node points itself
             SCREAMING_SNAKE_CASE_      		=     SCREAMING_SNAKE_CASE_      		=     new_node
       elif index == 0:  # insert at head
             SCREAMING_SNAKE_CASE_      		=     self.head
             SCREAMING_SNAKE_CASE_      		=     SCREAMING_SNAKE_CASE_      		=     new_node
       else:
             SCREAMING_SNAKE_CASE_      		=     self.head
             for _ in range(index - 1		):
                   SCREAMING_SNAKE_CASE_      		=     temp.next
             SCREAMING_SNAKE_CASE_      		=     temp.next
             SCREAMING_SNAKE_CASE_      		=     new_node
             if index == len(self		) - 1:  # insert at tail
                   SCREAMING_SNAKE_CASE_      		=     new_node



 def  lowerCAmelCase_    (				self    :						str		):
       return self.delete_nth(0		)



 def  lowerCAmelCase_    (				self    :						Any		):
       return self.delete_nth(len(self		) - 1		)



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




 def  lowerCAmelCase_    (				self    :						Optional[Any]		):
       return len(self		) == 0


def    UpperCAmelCase_				( )   ->					None:
      SCREAMING_SNAKE_CASE_      		=     CircularLinkedList()
      assert len(__lowerCAmelCase				) == 0
      assert circular_linked_list.is_empty() is True
      assert str(__lowerCAmelCase				) == ""

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

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

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

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

      assert circular_linked_list.is_empty() is False


if __name__ == "__main__":
   import doctest

   doctest.testmod()






'''simple docstring'''




import re





def 	__lowerCamelCase			(      __lowerCAmelCase       :							str		)		->  list:
   return [char.split() for char in re.split(r"""[^ a-z A-Z 0-9 \s]"""      ,    str_		)]





def 	__lowerCamelCase			(      __lowerCAmelCase       :							str		)		->  str:
   snake_case 						=   split_input(str_		)
   return "".join(
       ["""""".join([char.capitalize() for char in sub_str]		) for sub_str in string_split]		)





def 	__lowerCamelCase			(      __lowerCAmelCase       :							str      ,    __lowerCAmelCase       :							bool      ,    __lowerCAmelCase       :							str		)		->  str:
   try:
      snake_case 						=   split_input(__lowerCAmelCase		)
      if upper:
         snake_case 						=   """""".join(
             [
                 separator.join([char.upper() for char in sub_str]		)
                 for sub_str in string_split
             ]		)
      else:
         snake_case 						=   """""".join(
             [
                 separator.join([char.lower() for char in sub_str]		)
                 for sub_str in string_split
             ]		)
      return res_str
   except IndexError:
      return "not valid string"





def 	__lowerCamelCase			(      __lowerCAmelCase       :							str		)		->  str:
   return to_simple_case(__lowerCAmelCase		)





def 	__lowerCamelCase			(      __lowerCAmelCase       :							str		)		->  str:
   try:
      snake_case 						=   to_simple_case(__lowerCAmelCase		)
      return res_str[0].lower() + res_str[1:]
   except IndexError:
      return "not valid string"





def 	__lowerCamelCase			(      __lowerCAmelCase       :							str      ,    __lowerCAmelCase       :							bool		)		->  str:
   return to_complex_case(__lowerCAmelCase      ,    __lowerCAmelCase      ,    """_"""		)





def 	__lowerCamelCase			(      __lowerCAmelCase       :							str      ,    __lowerCAmelCase       :							bool		)		->  str:
   return to_complex_case(__lowerCAmelCase      ,    __lowerCAmelCase      ,    """-"""		)


if __name__ == "__main__":
 __import__("doctest").testmod()

