




from __future__ import annotations

from collections.abc import Iterator
from typing import Any

class        _lowerCamelCase  :

      """simple docstring"""

      def __init__(   self    :       Tuple       ,				snake_case    :       Any ):
          __UpperCamelCase     						=  data
          __UpperCamelCase     						=  None







      def __str__(   self    :       int ):
          return F"{self.data}"







class        _lowerCamelCase  :

      """simple docstring"""

      def __init__(   self    :       int ):
          __UpperCamelCase     						=  None
          __UpperCamelCase     						=  None







      def __iter__(   self    :       Any ):
          __UpperCamelCase     						=  self.front
          while node:
              yield node.data
              __UpperCamelCase     						=  node.next







      def __len__(   self    :       Tuple ):
          return len(tuple(iter(self ) ) )







      def __str__(   self    :       Dict ):
          return " <- ".join(str(__snake_case ) for item in self )







      def 					snake_case		(   self    :       str ):
          return len(self ) == 0







      def 					snake_case		(   self    :       Optional[int]       ,				snake_case    :       Any ):
          __UpperCamelCase     						=  Node(__snake_case )
          if self.is_empty():
              __UpperCamelCase     						=  __UpperCamelCase     						=  node
          else:
              assert isinstance(self.rear       ,				__snake_case )
              __UpperCamelCase     						=  node
              __UpperCamelCase     						=  node







      def 					snake_case		(   self    :       List[str] ):
          if self.is_empty():
              raise IndexError('''dequeue from empty queue''' )
          assert isinstance(self.front       ,				__snake_case )
          __UpperCamelCase     						=  self.front
          __UpperCamelCase     						=  self.front.next
          if self.front is None:
              __UpperCamelCase     						=  None
          return node.data







      def 					snake_case		(   self    :       List[str] ):
          __UpperCamelCase     						=  __UpperCamelCase     						=  None


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

 testmod()












def 					SCREAMING_SNAKE_CASE	(       __UpperCamelCase			:						float       ,     __UpperCamelCase			:						float      )  ->							float:
    return a + b


if __name__ == "__main__":
 _lowerCamelCase			 =						5
 _lowerCamelCase			 =						6
 print(F"The sum of {a} + {b} is {add(a, b)}")





