


from __future__ import annotations

from collections.abc import Iterator
from typing import Any


class 		_SCREAMING_SNAKE_CASE     :


     def __init__(  self							,					A_    ):
       _UpperCAmelCase		:							Any							=     data
       _UpperCAmelCase		:							Node | None							=     None


class 		_SCREAMING_SNAKE_CASE     :


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


     def __iter__(  self    ):
       _UpperCAmelCase		:							str							=     self.head
       while self.head:
         yield node.data
         _UpperCAmelCase		:							Optional[Any]							=     node.next
         if node == self.head:
           break


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


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


     def        __snake_case(  self							,					A_    ):
       self.insert_nth(len(self    )							,					A_    )


     def        __snake_case(  self							,					A_    ):
       self.insert_nth(0							,					A_    )


     def        __snake_case(  self							,					A_							,					A_    ):
       if index < 0 or index > len(self    ):
         raise IndexError("""list index out of range."""    )
       _UpperCAmelCase		:							List[Any]							=     Node(A_    )
       if self.head is None:
         _UpperCAmelCase		:							int							=     new_node  # first node points itself
         _UpperCAmelCase		:							Any							=     new_node
       elif index == 0:  # insert at head
         _UpperCAmelCase		:							str							=     self.head
         _UpperCAmelCase		:							Dict							=     new_node
       else:
         _UpperCAmelCase		:							int							=     self.head
         for _ in range(index - 1    ):
           _UpperCAmelCase		:							Optional[int]							=     temp.next
         _UpperCAmelCase		:							Union[str, Any]							=     temp.next
         _UpperCAmelCase		:							Union[str, Any]							=     new_node
         if index == len(self    ) - 1:  # insert at tail
           _UpperCAmelCase		:							Optional[int]							=     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							,					A_ = 0    ):
       if not 0 <= index < len(self    ):
         raise IndexError("""list index out of range."""    )
       _UpperCAmelCase		:							List[Any]							=     self.head
       if self.head == self.tail:  # just one node
         _UpperCAmelCase		:							Optional[Any]							=     None
       elif index == 0:  # delete head node
         _UpperCAmelCase		:							Dict							=     self.tail.next.next
         _UpperCAmelCase		:							Tuple							=     self.head.next
       else:
         _UpperCAmelCase		:							Dict							=     self.head
         for _ in range(index - 1    ):
           _UpperCAmelCase		:							Optional[int]							=     temp.next
         _UpperCAmelCase		:							Any							=     temp.next
         _UpperCAmelCase		:							List[str]							=     temp.next.next
         if index == len(self    ) - 1:  # delete at tail
           _UpperCAmelCase		:							Optional[int]							=     temp
       return delete_node.data




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




def    a__    (		):
  _UpperCAmelCase		:							Tuple							=     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()









from PIL import Image




def    a__    (		snake_case__					:							Image						,   snake_case__					:							int     ):
  _UpperCAmelCase		:							Optional[Any]							=     (259 * (level + 255)) / (255 * (259 - level))

  def contrast(snake_case__					:							int     ) -> int:
    return int(128 + factor * (c - 128)     )

  return img.point(snake_case__     )


if __name__ == "__main__":
 # Load image
 with Image.open('image_data/lena.jpg') as img:
  # Change contrast to 170
  SCREAMING_SNAKE_CASE__					:     int       =     change_contrast(img, 170)
  cont_img.save('image_data/lena_high_contrast.png', format='png')





