




'''simple docstring'''

from __future__ import annotations

from typing import Generic, TypeVar

A_      =							TypeVar("T")





class 							_snake_case	(    Generic[T]  ):
   def __init__(	self     : str       ,SCREAMING_SNAKE_CASE__     : T							):
     SCREAMING_SNAKE_CASE:Union[str, Any]   =   data  # Assign data
     SCREAMING_SNAKE_CASE:Dict   =   None  # Initialize next as null
     SCREAMING_SNAKE_CASE:Union[str, Any]   =   None  # Initialize prev as null





class 							_snake_case	(    Generic[T]  ):
   def __init__(	self     : Optional[Any]							):
     SCREAMING_SNAKE_CASE:Dict   =   None
   def       __UpperCamelCase  (	self     : Optional[Any]       ,SCREAMING_SNAKE_CASE__     : T							):



     if self.head is None:
       SCREAMING_SNAKE_CASE:List[Any]   =   Node(UpperCamelCase_							)
     else:
       SCREAMING_SNAKE_CASE:int   =   Node(UpperCamelCase_							)
       SCREAMING_SNAKE_CASE:Optional[Any]   =   new_node
       SCREAMING_SNAKE_CASE:Any   =   self.head
       SCREAMING_SNAKE_CASE:Any   =   None
       SCREAMING_SNAKE_CASE:Union[str, Any]   =   new_node
   def       __UpperCamelCase  (	self     : str							):



     if self.head is None:
       return None
     else:
       assert self.head is not None
       SCREAMING_SNAKE_CASE:Any   =   self.head.data
       SCREAMING_SNAKE_CASE:Optional[Any]   =   self.head.next
       if self.head is not None:
         SCREAMING_SNAKE_CASE:Optional[int]   =   None
       return temp
   def       __UpperCamelCase  (	self     : Union[str, Any]							):
     return self.head.data if self.head is not None else None
   def __len__(	self     : List[Any]							):
     SCREAMING_SNAKE_CASE:Tuple   =   self.head
     SCREAMING_SNAKE_CASE:Dict   =   0
     while temp is not None:
       count += 1
       SCREAMING_SNAKE_CASE:Tuple   =   temp.next
     return count
   def       __UpperCamelCase  (	self     : List[str]							):
     return self.head is None







   def       __UpperCamelCase  (	self     : int							):
     print("stack elements are:"							)
     SCREAMING_SNAKE_CASE:int   =   self.head
     while temp is not None:
       print(temp.data       ,end="->"							)
       SCREAMING_SNAKE_CASE:Union[str, Any]   =   temp.next


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









'''simple docstring'''

from typing import TYPE_CHECKING

from ...utils import OptionalDependencyNotAvailable, _LazyModule, is_tokenizers_available, is_torch_available


A_      =							{"configuration_yoso": ["YOSO_PRETRAINED_CONFIG_ARCHIVE_MAP", "YosoConfig"]}

try:
    if not is_torch_available():
        raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
    pass
else:
    A_      =							[
        "YOSO_PRETRAINED_MODEL_ARCHIVE_LIST",
        "YosoForMaskedLM",
        "YosoForMultipleChoice",
        "YosoForQuestionAnswering",
        "YosoForSequenceClassification",
        "YosoForTokenClassification",
        "YosoLayer",
        "YosoModel",
        "YosoPreTrainedModel",
    ]


if TYPE_CHECKING:
    from .configuration_yoso import YOSO_PRETRAINED_CONFIG_ARCHIVE_MAP, YosoConfig

    try:
        if not is_torch_available():
            raise OptionalDependencyNotAvailable()
    except OptionalDependencyNotAvailable:
        pass
    else:
        from .modeling_yoso import (
            YOSO_PRETRAINED_MODEL_ARCHIVE_LIST,
            YosoForMaskedLM,
            YosoForMultipleChoice,
            YosoForQuestionAnswering,
            YosoForSequenceClassification,
            YosoForTokenClassification,
            YosoLayer,
            YosoModel,
            YosoPreTrainedModel,
        )


else:
    import sys

    A_      =							_LazyModule(__name__, globals()["__file__"], _import_structure)






