code: 
  
  
  from __future__ import annotations
  
  from collections.abc import Iterator
  from typing import Any
  
  
  
  
  
  class        lowercase_				:
  
  
  							def __init__(   self			,    _UpperCAmelCase		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													a_					=		data
  													a_					=		None
  
  
  
  
  
  
  							def __str__(   self		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													return f"{self.data}"
  
  
  
  
  
  class        lowercase_				:
  
  
  							def __init__(   self		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													a_					=		None
  													a_					=		None
  
  
  							def __iter__(   self		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													a_					=		self.front
  													while node:
  																			yield node.data
  																			a_					=		node.next
  
  
  							def __len__(   self		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													return len(tuple(iter(self		)		)		)
  
  
  							def __str__(   self		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													return " <- ".join(str(_UpperCAmelCase		) for item in self		)
  
  
  							def 						lowercase__     (   self		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													return len(self		) == 0
  
  
  							def 						lowercase__     (   self			,    _UpperCAmelCase		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													a_					=		Node(_UpperCAmelCase		)
  													if self.is_empty():
  																			a_					=		node
  													else:
  																			assert isinstance(self.rear			,    _UpperCAmelCase		)
  																			a_					=		node
  																			a_					=		node
  
  
  							def 						lowercase__     (   self		):
  
  
  
  
  
  
  
  													"""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 						lowercase__     (   self		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													a_					=		None
  
  
  if __name__ == "__main__":
  	from doctest import testmod
  
  	testmod()
style_context: 
  
  
  import abc
  import copy
  import dataclasses
  from dataclasses import dataclass
  from typing import ClassVar, Dict, Type, TypeVar
  
  from ..features import Features
  
  
  A_    :					Tuple             =TypeVar("""T""", bound="""TaskTemplate""")
  
  
  
  
  
  @dataclass(frozen=UpperCamelCase__)
  class        lowercase_				( abc.ABC):
  
  
  
  
  
  
  							"""simple docstring"""
  
  
  
  
  
  
  
  							snake_case_        =		42
  							snake_case_        =		42
  							snake_case_        =		42
  
  
  							def 						lowercase__     (   self			,    _UpperCAmelCase		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													return copy.deepcopy(self		)
  
  
  							@property
  							def 						lowercase__     (   self		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													return Features(**self.input_schema			,    **self.label_schema		)
  
  
  							@property
  							@abc.abstractmethod
  							def 						lowercase__     (   self		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													raise NotImplementedError
  
  
  
  
  
  
  							@classmethod
  							def 						lowercase__     (   cls			,    _UpperCAmelCase		):
  
  
  
  
  
  
  
  													"""simple docstring"""
  
  
  													a_					=		{f.name for f in dataclasses.fields(cls		)}
  													return cls(**{k: v for k, v in template_dict.items() if k in field_names}		)