

from __future__ import annotations

from collections.abc import Iterator
from typing import Any


class 					A		:







    """simple docstring"""





    def __init__( self					:			List[Any],lowercase_					:			Any						)->       None:





        '''simple docstring'''







        A__        =  data
        A__        =  None


    def __str__( self					:			Union[str, Any]						)->       str:





        '''simple docstring'''







        return F'{self.data}'




class 					A		:







    """simple docstring"""





    def __init__( self					:			List[Any]						)->       None:





        '''simple docstring'''







        A__        =  None
        A__        =  None


    def __iter__( self					:			int						)->       Iterator[Any]:





        '''simple docstring'''







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


    def __len__( self					:			int						)->       int:





        '''simple docstring'''







        return len(tuple(iter(self						)						)						)


    def __str__( self					:			str						)->       str:





        '''simple docstring'''







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


    def 		snake_case__	( self					:			str						)->       bool:





        '''simple docstring'''







        return len(self						) == 0


    def 		snake_case__	( self					:			Optional[int],lowercase_					:			Any						)->       None:





        '''simple docstring'''







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


    def 		snake_case__	( self					:			Optional[int]						)->       Any:





        '''simple docstring'''







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


    def 		snake_case__	( self					:			List[str]						)->       None:





        '''simple docstring'''







        A__        =  None


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

     testmod()






'''simple docstring'''



import pytest

from datasets.utils.version import Version


@pytest.mark.parametrize(
    '''other, expected_equality'''   ,				[
        (Version('''1.0.0'''			), True),
        ('''1.0.0''', True),
        (Version('''2.0.0'''			), False),
        ('''2.0.0''', False),
        ('''1''', False),
        ('''a''', False),
        (1, False),
        (None, False),
    ]   ,				)
def 							__UpperCAmelCase				(				UpperCamelCase__				:Optional[int]   ,				UpperCamelCase__				:int			)		->						List[str]:
				snake_case__      :   Optional[int]      =    Version('''1.0.0'''			)
				assert (version == other) is expected_equality
				assert (version != other) is not expected_equality
				assert (hash(UpperCamelCase__			) == hash(UpperCamelCase__			)) is expected_equality




