from __future__ import annotations

from typing import Generic, TypeVar

UpperCAmelCase							   =      TypeVar("""T""")






class 							_SCREAMING_SNAKE_CASE(   Generic[T]	):
   def __init__(    self							,     lowerCAmelCase_    )	->int:
        a  :    str				=						data  # Assign data
        a  :    Node[T] | None				=						None  # Initialize next as null
        a  :    Node[T] | None				=						None  # Initialize prev as null






class 							_SCREAMING_SNAKE_CASE(   Generic[T]	):
   def __init__(    self    )	->None:
        a  :    Node[T] | None				=						None
   def _lowercase(    self							,     lowerCAmelCase_    )	->None:
        if self.head is None:
             a  :    str				=						Node(lowerCAmelCase_    )
        else:
             a  :    str				=						Node(lowerCAmelCase_    )
             a  :    Optional[Any]				=						new_node
             a  :    Optional[Any]				=						self.head
             a  :    List[Any]				=						None
             a  :    int				=						new_node
   def _lowercase(    self    )	->T | None:
        if self.head is None:
             return None
        else:
             assert self.head is not None
             a  :    Union[str, Any]				=						self.head.data
             a  :    Optional[Any]				=						self.head.next
             if self.head is not None:
                  a  :    Union[str, Any]				=						None
             return temp
   def _lowercase(    self    )	->T | None:
        return self.head.data if self.head is not None else None
   def __len__(    self    )	->int:
        a  :    int				=						self.head
        a  :    str				=						0
        while temp is not None:
             count += 1
             a  :    List[Any]				=						temp.next
        return count
   def _lowercase(    self    )	->bool:
        return self.head is None


   def _lowercase(    self    )	->None:
        print('''stack elements are:'''    )
        a  :    str				=						self.head
        while temp is not None:
             print(temp.data							,     end='''->'''    )
             a  :    List[Any]				=						temp.next


# Code execution starts here
if __name__ == "__main__":
  # Start with the empty stack
  UpperCAmelCase							   =      Stack()

  # Insert 4 at the beginning. So stack becomes 4->None
  print("""Stack operations using Doubly LinkedList""")
  stack.push(4)

  # Insert 5 at the beginning. So stack becomes 4->5->None
  stack.push(5)

  # Insert 6 at the beginning. So stack becomes 4->5->6->None
  stack.push(6)

  # Insert 7 at the beginning. So stack becomes 4->5->6->7->None
  stack.push(7)

  # Print the stack
  stack.print_stack()

  # Print the top element
  print("""\nTop element is """, stack.top())

  # Print the stack size
  print("""Size of the stack is """, len(stack))

  # pop the top element
  stack.pop()

  # pop the top element
  stack.pop()

  # two elements have now been popped off
  stack.print_stack()

  # Print True if the stack is empty else False
  print("""\nstack is empty:""", stack.is_empty())
import unittest

from transformers import BlenderbotTokenizer, BlenderbotTokenizerFast
from transformers.utils import cached_property






class 							_SCREAMING_SNAKE_CASE(   unittest.TestCase	):
   @cached_property
   def _lowercase(    self    )	->List[str]:
        return BlenderbotTokenizer.from_pretrained('''facebook/blenderbot-3B'''    )
   @cached_property
   def _lowercase(    self    )	->str:
        return BlenderbotTokenizerFast.from_pretrained('''facebook/blenderbot-3B'''    )
   def _lowercase(    self    )	->str:
        a  :    Optional[int]				=						self.tokenizer_ab
        a  :    List[Any]				=						''' I am a small frog.'''
        a  :    Optional[Any]				=						tok([src_text]							,     padding=lowerCAmelCase_							,     truncation=lowerCAmelCase_    )['''input_ids''']
        a  :    int				=						tok.batch_decode(lowerCAmelCase_							,     skip_special_tokens=lowerCAmelCase_							,     clean_up_tokenization_spaces=lowerCAmelCase_    )[0]
        assert src_text == decoded
   def _lowercase(    self    )	->Dict:
        a  :    List[Any]				=						self.rust_tokenizer_ab
        a  :    str				=						''' I am a small frog.'''
        a  :    Tuple				=						tok([src_text]							,     padding=lowerCAmelCase_							,     truncation=lowerCAmelCase_    )['''input_ids''']
        a  :    Optional[Any]				=						tok.batch_decode(lowerCAmelCase_							,     skip_special_tokens=lowerCAmelCase_							,     clean_up_tokenization_spaces=lowerCAmelCase_    )[0]
        assert src_text == decoded
   def _lowercase(    self    )	->Tuple:
        assert self.tokenizer_ab.add_prefix_space
        assert self.tokenizer_ab([''' Sam''', '''Sam''']    ).input_ids == [[55_02, 2], [55_02, 2]]


   def _lowercase(    self    )	->Optional[Any]:
        assert self.rust_tokenizer_ab.add_prefix_space
        assert self.rust_tokenizer_ab([''' Sam''', '''Sam''']    ).input_ids == [[55_02, 2], [55_02, 2]]