




from __future__ import annotations

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


class 							__SCREAMING_SNAKE_CASE				:
					_lowerCamelCase						    =					("""_front""", """_back""", """_len""")


					@dataclass
					class 							__SCREAMING_SNAKE_CASE				:
										_lowerCamelCase						    =					None
										_lowerCamelCase						    =					None
										_lowerCamelCase						    =					None


					class 							__SCREAMING_SNAKE_CASE				:
										_lowerCamelCase						    =					("""_cur""",)

										def __init__(							self					,			__lowercase   ):







											'''simple docstring'''




											lowerCamelCase_				:						Optional[int]				  =				cur

										def __iter__(							self   ):







											'''simple docstring'''




											return self





										def       lowercase_				(							self   ):







											'''simple docstring'''




											if self._cur is None:
												# finished iterating
												raise StopIteration
											lowerCamelCase_				:						Any				  =				self._cur.val
											lowerCamelCase_				:						Dict				  =				self._cur.next_node

											return val

					def __init__(							self					,			__lowercase = None   ):







						'''simple docstring'''




						lowerCamelCase_				:						Any				  =				None
						lowerCamelCase_				:						Any				  =				None
						lowerCamelCase_				:						int				  =				0

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

					def       lowercase_				(							self					,			__lowercase   ):







						'''simple docstring'''




						lowerCamelCase_				:						Dict				  =				self._Node(__lowercase					,			__lowercase					,			__lowercase   )
						if self.is_empty():
							# front = back
							lowerCamelCase_				:						Any				  =				node
							lowerCamelCase_				:						int				  =				1
						else:
							# connect nodes
							lowerCamelCase_				:						Optional[int]				  =				node
							lowerCamelCase_				:						Optional[Any]				  =				self._back
							lowerCamelCase_				:						str				  =				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       lowercase_				(							self					,			__lowercase   ):







						'''simple docstring'''




						lowerCamelCase_				:						List[str]				  =				self._Node(__lowercase					,			__lowercase					,			__lowercase   )
						if self.is_empty():
							# front = back
							lowerCamelCase_				:						Optional[int]				  =				node
							lowerCamelCase_				:						Dict				  =				1
						else:
							# connect nodes
							lowerCamelCase_				:						Dict				  =				self._front
							lowerCamelCase_				:						Union[str, Any]				  =				node
							lowerCamelCase_				:						Tuple				  =				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       lowercase_				(							self					,			__lowercase   ):







						'''simple docstring'''




						for val in iterable:
							self.append(__lowercase   )

					def       lowercase_				(							self					,			__lowercase   ):







						'''simple docstring'''




						for val in iterable:
							self.appendleft(__lowercase   )

					def       lowercase_				(							self   ):







						'''simple docstring'''




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

						lowerCamelCase_				:						Tuple				  =				self._back
						lowerCamelCase_				:						Union[str, Any]				  =				self._back.prev_node  # set new back
						# drop the last node - python will deallocate memory automatically
						lowerCamelCase_				:						Tuple				  =				None

						self._len -= 1

						return topop.val

					def       lowercase_				(							self   ):







						'''simple docstring'''




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

						lowerCamelCase_				:						Union[str, Any]				  =				self._front
						lowerCamelCase_				:						Tuple				  =				self._front.next_node  # set new front and drop the first node
						lowerCamelCase_				:						int				  =				None

						self._len -= 1

						return topop.val

					def       lowercase_				(							self   ):







						'''simple docstring'''




						return self._front is None

					def __len__(							self   ):







						'''simple docstring'''




						return self._len

					def __eq__(							self					,			__lowercase   ):







						'''simple docstring'''




						if not isinstance(__lowercase					,			__lowercase   ):
							return NotImplemented

						lowerCamelCase_				:						Any				  =				self._front
						lowerCamelCase_				:						Tuple				  =				other._front

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

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

						return True

					def __iter__(							self   ):







						'''simple docstring'''




						return Deque._Iterator(self._front   )





					def __repr__(							self   ):







						'''simple docstring'''




						lowerCamelCase_				:						Optional[int]				  =				[]
						lowerCamelCase_				:						str				  =				self._front
						while aux is not None:
							# append the values in a list to display
							values_list.append(aux.val   )
							lowerCamelCase_				:						Optional[int]				  =				aux.next_node

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


if __name__ == "__main__":
							import doctest

							doctest.testmod()



from __future__ import annotations

from collections.abc import Iterator
from typing import Any

class 					__UpperCamelCase					:







	def __init__( self:			Optional[Any]	,			__UpperCamelCase:			Any   ):

						'''simple docstring'''





						__magic_name__				=     data
						__magic_name__				=     None







	def __str__( self:			Optional[int]   ):

						'''simple docstring'''





						return F'{self.data}'




class 					__UpperCamelCase					:







	def __init__( self:			List[Any]   ):

						'''simple docstring'''





						__magic_name__				=     None
						__magic_name__				=     None







	def __iter__( self:			str   ):

						'''simple docstring'''





						__magic_name__				=     self.front
						while node:
											yield node.data
											__magic_name__				=     node.next







	def __len__( self:			Any   ):

						'''simple docstring'''





						return len(tuple(iter(self   )   )   )







	def __str__( self:			List[str]   ):

						'''simple docstring'''





						return " <- ".join(str(__UpperCamelCase   ) for item in self   )







	def 						_SCREAMING_SNAKE_CASE				( self:			Any   ):

						'''simple docstring'''





						return len(self   ) == 0







	def 						_SCREAMING_SNAKE_CASE				( self:			Any	,			__UpperCamelCase:			Any   ):

						'''simple docstring'''





						__magic_name__				=     Node(__UpperCamelCase   )
						if self.is_empty():
											__magic_name__				=     __magic_name__				=     node
						else:
											assert isinstance(self.rear	,			__UpperCamelCase   )
											__magic_name__				=     node
											__magic_name__				=     node







	def 						_SCREAMING_SNAKE_CASE				( self:			Any   ):

						'''simple docstring'''





						if self.is_empty():
											raise IndexError('dequeue from empty queue'   )
						assert isinstance(self.front	,			__UpperCamelCase   )
						__magic_name__				=     self.front
						__magic_name__				=     self.front.next
						if self.front is None:
											__magic_name__				=     None
						return node.data







	def 						_SCREAMING_SNAKE_CASE				( self:			Tuple   ):

						'''simple docstring'''





						__magic_name__				=     __magic_name__				=     None


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

						testmod()




