code: 
  
  
  from __future__ import annotations
  
  from typing import Generic, TypeVar
  
  __snake_case             =	TypeVar('''T''')
  
  
  
  class   __lowerCamelCase (Generic[T]	):
  
  
  
  
  
  
  
         def __init__( self:   int,A_:   T				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              __UpperCamelCase   = data  # Assign data
              __UpperCamelCase   = None  # Initialize next as null
              __UpperCamelCase   = None  # Initialize prev as null
  
  
  
  class   __lowerCamelCase (Generic[T]	):
  
  
  
  
  
  
  
         def __init__( self:   Dict				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              __UpperCamelCase   = None
  
  
  
  
  
  
  
         def 		snake_case_  ( self:   int,A_:   T				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              if self.head is None:
                   __UpperCamelCase   = Node(A_				)
              else:
                   __UpperCamelCase   = Node(A_				)
                   __UpperCamelCase   = new_node
                   __UpperCamelCase   = self.head
                   __UpperCamelCase   = None
                   __UpperCamelCase   = new_node
  
  
  
  
  
  
  
         def 		snake_case_  ( self:   Optional[Any]				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              if self.head is None:
                   return None
              else:
                   assert self.head is not None
                   __UpperCamelCase   = self.head.data
                   __UpperCamelCase   = self.head.next
                   if self.head is not None:
                        __UpperCamelCase   = None
                   return temp
  
  
  
  
  
  
  
         def 		snake_case_  ( self:   Union[str, Any]				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              return self.head.data if self.head is not None else None
  
  
  
  
  
  
  
         def __len__( self:   Dict				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              __UpperCamelCase   = self.head
              __UpperCamelCase   = 0
              while temp is not None:
                   count += 1
                   __UpperCamelCase   = temp.next
              return count
  
  
  
  
  
  
  
         def 		snake_case_  ( self:   Any				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              return self.head is None
  
  
  
  
  
  
  
         def 		snake_case_  ( self:   int				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              print('stack elements are:'				)
              __UpperCamelCase   = self.head
              while temp is not None:
                   print(temp.data,end='->'				)
                   __UpperCamelCase   = 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())
  
  
  
style_context: 
  
  
  from ..utils import DummyObject, requires_backends
  
  
  
  class   __lowerCamelCase (metaclass=_a	):
         _lowercase       							=    ["""torch""", """transformers""", """k_diffusion"""]
  
  
  
  
  
  
  
         def __init__( self:   Tuple,*A_:   Union[str, Any],**A_:   Tuple				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              requires_backends(self,['torch', 'transformers', 'k_diffusion']				)
  
  
  
  
  
  
  
         @classmethod
         def 		snake_case_  ( cls:   int,*A_:   Optional[Any],**A_:   Tuple				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              requires_backends(cls,['torch', 'transformers', 'k_diffusion']				)
  
  
  
  
  
  
  
         @classmethod
         def 		snake_case_  ( cls:   int,*A_:   Tuple,**A_:   Tuple				):
  
  
  
  
  
  
              '''simple docstring'''
  
  
  
  
              requires_backends(cls,['torch', 'transformers', 'k_diffusion']				)
  
  
  