
'''simple docstring'''







from __future__ import annotations

from collections.abc import Iterable
from dataclasses import dataclass
from typing import Any







class 		snake_case_       :



   """simple docstring"""





   __lowerCAmelCase	:							List[str]								=('''_front''', '''_back''', '''_len''')







   @dataclass
   class 		snake_case_       :



      """simple docstring"""





      __lowerCAmelCase	:							Any								=None
      __lowerCAmelCase	:							Deque._Node | None								=None
      __lowerCAmelCase	:							Deque._Node | None								=None







   class 		snake_case_       :



      """simple docstring"""





      __lowerCAmelCase	:							Tuple								=('''_cur''',)







      def __init__( self			,   UpperCamelCase):
             lowerCamelCase__				   =      cur







      def __iter__( self):
             return self







      def     __UpperCAmelCase      ( self):
             if self._cur is None:
                    # finished iterating
                    raise StopIteration
             lowerCamelCase__				   =      self._cur.val
             lowerCamelCase__				   =      self._cur.next_node

             return val







   def __init__( self			,   UpperCamelCase = None):
          lowerCamelCase__				   =      None
          lowerCamelCase__				   =      None
          lowerCamelCase__				   =      0

          if iterable is not None:
                 # append every value to the deque
                 for val in iterable:
                        self.append(UpperCamelCase)







   def     __UpperCAmelCase      ( self			,   UpperCamelCase):
          lowerCamelCase__				   =      self._Node(UpperCamelCase			,   UpperCamelCase			,   UpperCamelCase)
          if self.is_empty():
                 # front = back
                 lowerCamelCase__				   =      lowerCamelCase__				   =      node
                 lowerCamelCase__				   =      1
          else:
                 # connect nodes
                 lowerCamelCase__				   =      node
                 lowerCamelCase__				   =      self._back
                 lowerCamelCase__				   =      node  # assign new back to the new node

                 self._len += 1

                 # make sure there were no errors
                 assert not self.is_empty(), "Error on appending value."







   def     __UpperCAmelCase      ( self			,   UpperCamelCase):
          lowerCamelCase__				   =      self._Node(UpperCamelCase			,   UpperCamelCase			,   UpperCamelCase)
          if self.is_empty():
                 # front = back
                 lowerCamelCase__				   =      lowerCamelCase__				   =      node
                 lowerCamelCase__				   =      1
          else:
                 # connect nodes
                 lowerCamelCase__				   =      self._front
                 lowerCamelCase__				   =      node
                 lowerCamelCase__				   =      node  # assign new front to the new node

                 self._len += 1

                 # make sure there were no errors
                 assert not self.is_empty(), "Error on appending value."







   def     __UpperCAmelCase      ( self			,   UpperCamelCase):
          for val in iterable:
                 self.append(UpperCamelCase)







   def     __UpperCAmelCase      ( self			,   UpperCamelCase):
          for val in iterable:
                 self.appendleft(UpperCamelCase)







   def     __UpperCAmelCase      ( self):
          assert not self.is_empty(), "Deque is empty."

          lowerCamelCase__				   =      self._back
          lowerCamelCase__				   =      self._back.prev_node  # set new back
          # drop the last node - python will deallocate memory automatically
          lowerCamelCase__				   =      None

          self._len -= 1

          return topop.val







   def     __UpperCAmelCase      ( self):
          assert not self.is_empty(), "Deque is empty."

          lowerCamelCase__				   =      self._front
          lowerCamelCase__				   =      self._front.next_node  # set new front and drop the first node
          lowerCamelCase__				   =      None

          self._len -= 1

          return topop.val







   def     __UpperCAmelCase      ( self):
          return self._front is None







   def __len__( self):
          return self._len







   def __eq__( self			,   UpperCamelCase):

          if not isinstance(UpperCamelCase			,   UpperCamelCase):
                 return NotImplemented

          lowerCamelCase__				   =      self._front
          lowerCamelCase__				   =      other._front

          # if the length of the dequeues are not the same, they are not equal
          if len(self) != len(UpperCamelCase):
                 return False

          while me is not None and oth is not None:
                 # compare every value
                 if me.val != oth.val:
                        return False
                 lowerCamelCase__				   =      me.next_node
                 lowerCamelCase__				   =      oth.next_node

          return True







   def __iter__( self):
          return Deque._Iterator(self._front)







   def __repr__( self):
          lowerCamelCase__				   =      []
          lowerCamelCase__				   =      self._front
          while aux is not None:
                 # append the values in a list to display
                 values_list.append(aux.val)
                 lowerCamelCase__				   =      aux.next_node

          return f"""[{", ".join(repr(UpperCamelCase) for val in values_list)}]"""


if __name__ == "__main__":
    import doctest

    doctest.testmod()



'''simple docstring'''







from ..utils import DummyObject, requires_backends







class 		snake_case_       (						metaclass=A__						):



   """simple docstring"""





   __lowerCAmelCase	:							List[str]								=['''torch''', '''librosa''']







   def __init__( self			,   *UpperCamelCase			,   **UpperCamelCase):
          requires_backends(self			,   ["torch", "librosa"])







   @classmethod
   def     __UpperCAmelCase      ( cls			,   *UpperCamelCase			,   **UpperCamelCase):
          requires_backends(cls			,   ["torch", "librosa"])







   @classmethod
   def     __UpperCAmelCase      ( cls			,   *UpperCamelCase			,   **UpperCamelCase):
          requires_backends(cls			,   ["torch", "librosa"])







class 		snake_case_       (						metaclass=A__						):



   """simple docstring"""





   __lowerCAmelCase	:							Union[str, Any]								=['''torch''', '''librosa''']







   def __init__( self			,   *UpperCamelCase			,   **UpperCamelCase):
          requires_backends(self			,   ["torch", "librosa"])







   @classmethod
   def     __UpperCAmelCase      ( cls			,   *UpperCamelCase			,   **UpperCamelCase):
          requires_backends(cls			,   ["torch", "librosa"])







   @classmethod
   def     __UpperCAmelCase      ( cls			,   *UpperCamelCase			,   **UpperCamelCase):
          requires_backends(cls			,   ["torch", "librosa"])

