


from __future__ import annotations

from typing import Generic, TypeVar

_snake_case					=					TypeVar('''T''')
class      UpperCAmelCase_ ( Generic[T]   ):

   '''simple docstring'''




   def __init__(		self						,    __A			):






     """simple docstring"""





     lowerCamelCase			: Tuple   =    data  # Assign data
     lowerCamelCase			: Node[T] | None   =    None  # Initialize next as null
     lowerCamelCase			: Node[T] | None   =    None  # Initialize prev as null



class      UpperCAmelCase_ ( Generic[T]   ):

   '''simple docstring'''




   def __init__(		self			):






     """simple docstring"""





     lowerCamelCase			: Node[T] | None   =    None






   def _snake_case   (		self						,    __A			):






     """simple docstring"""





     if self.head is None:
       lowerCamelCase			: Any   =    Node(__A			)
     else:
       lowerCamelCase			: str   =    Node(__A			)
       lowerCamelCase			: Optional[Any]   =    new_node
       lowerCamelCase			: List[str]   =    self.head
       lowerCamelCase			: Optional[int]   =    None
       lowerCamelCase			: List[Any]   =    new_node






   def _snake_case   (		self			):






     """simple docstring"""





     if self.head is None:
       return None
     else:
       assert self.head is not None
       lowerCamelCase			: Tuple   =    self.head.data
       lowerCamelCase			: List[str]   =    self.head.next
       if self.head is not None:
         lowerCamelCase			: Optional[int]   =    None
       return temp






   def _snake_case   (		self			):






     """simple docstring"""





     return self.head.data if self.head is not None else None






   def __len__(		self			):






     """simple docstring"""





     lowerCamelCase			: str   =    self.head
     lowerCamelCase			: List[Any]   =    0
     while temp is not None:
       count += 1
       lowerCamelCase			: Tuple   =    temp.next
     return count






   def _snake_case   (		self			):






     """simple docstring"""





     return self.head is None






   def _snake_case   (		self			):






     """simple docstring"""





     print("stack elements are:"			)
     lowerCamelCase			: Tuple   =    self.head
     while temp is not None:
       print(temp.data						,    end="->"			)
       lowerCamelCase			: Optional[Any]   =    temp.next


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







from typing import TYPE_CHECKING

from ...utils import (
    OptionalDependencyNotAvailable,
    _LazyModule,
    is_torch_available,
)


_snake_case					=					{
    '''configuration_rwkv''': ['''RWKV_PRETRAINED_CONFIG_ARCHIVE_MAP''', '''RwkvConfig''', '''RwkvOnnxConfig'''],
}

try:
   if not is_torch_available():
      raise OptionalDependencyNotAvailable()
except OptionalDependencyNotAvailable:
   pass
else:
   _snake_case					=					[
       '''RWKV_PRETRAINED_MODEL_ARCHIVE_LIST''',
       '''RwkvForCausalLM''',
       '''RwkvModel''',
       '''RwkvPreTrainedModel''',
   ]


if TYPE_CHECKING:
   from .configuration_rwkv import RWKV_PRETRAINED_CONFIG_ARCHIVE_MAP, RwkvConfig, RwkvOnnxConfig

   try:
      if not is_torch_available():
         raise OptionalDependencyNotAvailable()
   except OptionalDependencyNotAvailable:
      pass
   else:
      from .modeling_rwkv import (
          RWKV_PRETRAINED_MODEL_ARCHIVE_LIST,
          RwkvForCausalLM,
          RwkvModel,
          RwkvPreTrainedModel,
      )
else:
   import sys

   _snake_case					=					_LazyModule(__name__, globals()['''__file__'''], _import_structure, module_spec=__spec__)



