




from __future__ import annotations

from typing import Generic, TypeVar

lowerCamelCase_  						=   TypeVar("T")
class       __a					( Generic[T]     ):


     """simple docstring"""


     def __init__(	self			: int				,_UpperCamelCase			: T						)		->   str:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=data  # Assign data
         SCREAMING_SNAKE_CASE__								=None  # Initialize next as null
         SCREAMING_SNAKE_CASE__								=None  # Initialize prev as null






class       __a					( Generic[T]     ):


     """simple docstring"""


     def __init__(	self			: Tuple						)		->   None:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=None




     def   __A				(	self			: Dict				,_UpperCamelCase			: T						)		->   None:


         '''simple docstring'''





         if self.head is None:
             SCREAMING_SNAKE_CASE__								=Node(_UpperCamelCase						)
         else:
             SCREAMING_SNAKE_CASE__								=Node(_UpperCamelCase						)
             SCREAMING_SNAKE_CASE__								=new_node
             SCREAMING_SNAKE_CASE__								=self.head
             SCREAMING_SNAKE_CASE__								=None
             SCREAMING_SNAKE_CASE__								=new_node




     def   __A				(	self			: List[str]						)		->   T | None:


         '''simple docstring'''





         if self.head is None:
             return None
         else:
             assert self.head is not None
             SCREAMING_SNAKE_CASE__								=self.head.data
             SCREAMING_SNAKE_CASE__								=self.head.next
             if self.head is not None:
                 SCREAMING_SNAKE_CASE__								=None
             return temp




     def   __A				(	self			: List[str]						)		->   T | None:


         '''simple docstring'''





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




     def __len__(	self			: Optional[int]						)		->   int:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=self.head
         SCREAMING_SNAKE_CASE__								=0
         while temp is not None:
             count += 1
             SCREAMING_SNAKE_CASE__								=temp.next
         return count




     def   __A				(	self			: List[Any]						)		->   bool:


         '''simple docstring'''





         return self.head is None




     def   __A				(	self			: int						)		->   None:


         '''simple docstring'''





         print("""stack elements are:"""						)
         SCREAMING_SNAKE_CASE__								=self.head
         while temp is not None:
             print(temp.data				,end="""->"""						)
             SCREAMING_SNAKE_CASE__								=temp.next


# Code execution starts here
if __name__ == "__main__":
    # Start with the empty stack
    lowerCamelCase_  						=   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 dataclasses import dataclass
from typing import Optional

from transformers.utils import ModelOutput
@dataclass
class       __a					( __lowerCamelCase     ):


     """simple docstring"""


     _A				:    float
     _A				:    Optional[float]									=  None
     _A				:    Optional[float]									=  None






class       __a					( unittest.TestCase     ):


     """simple docstring"""


     def   __A				(	self			: Dict						)		->   Optional[int]:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0						)
         self.assertEqual(x.a				,3_0						)
         self.assertIsNone(x.b						)
         self.assertIsNone(x.c						)
         with self.assertRaises(_UpperCamelCase						):
             SCREAMING_SNAKE_CASE__								=x.d




     def   __A				(	self			: Tuple						)		->   Dict:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0				,b=1_0						)
         self.assertEqual(x[0]				,3_0						)
         self.assertEqual(x[1]				,1_0						)
         self.assertEqual(x[:2]				,(3_0, 1_0)						)
         self.assertEqual(x[:]				,(3_0, 1_0)						)

         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0				,c=1_0						)
         self.assertEqual(x[0]				,3_0						)
         self.assertEqual(x[1]				,1_0						)
         self.assertEqual(x[:2]				,(3_0, 1_0)						)
         self.assertEqual(x[:]				,(3_0, 1_0)						)




     def   __A				(	self			: List[str]						)		->   Dict:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0				,b=1_0						)
         self.assertEqual(x["""a"""]				,3_0						)
         self.assertEqual(x["""b"""]				,1_0						)
         with self.assertRaises(_UpperCamelCase						):
             SCREAMING_SNAKE_CASE__								=x["""c"""]

         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0				,c=1_0						)
         self.assertEqual(x["""a"""]				,3_0						)
         self.assertEqual(x["""c"""]				,1_0						)
         with self.assertRaises(_UpperCamelCase						):
             SCREAMING_SNAKE_CASE__								=x["""b"""]




     def   __A				(	self			: Optional[int]						)		->   List[str]:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0						)
         self.assertEqual(list(x.keys()						)				,["""a"""]						)
         self.assertEqual(list(x.values()						)				,[3_0]						)
         self.assertEqual(list(x.items()						)				,[("""a""", 3_0)]						)
         self.assertEqual(list(_UpperCamelCase						)				,["""a"""]						)

         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0				,b=1_0						)
         self.assertEqual(list(x.keys()						)				,["""a""", """b"""]						)
         self.assertEqual(list(x.values()						)				,[3_0, 1_0]						)
         self.assertEqual(list(x.items()						)				,[("""a""", 3_0), ("""b""", 1_0)]						)
         self.assertEqual(list(_UpperCamelCase						)				,["""a""", """b"""]						)

         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0				,c=1_0						)
         self.assertEqual(list(x.keys()						)				,["""a""", """c"""]						)
         self.assertEqual(list(x.values()						)				,[3_0, 1_0]						)
         self.assertEqual(list(x.items()						)				,[("""a""", 3_0), ("""c""", 1_0)]						)
         self.assertEqual(list(_UpperCamelCase						)				,["""a""", """c"""]						)

         with self.assertRaises(_UpperCamelCase						):
             SCREAMING_SNAKE_CASE__								=x.update({"""d""": 2_0}						)
         with self.assertRaises(_UpperCamelCase						):
             del x["a"]
         with self.assertRaises(_UpperCamelCase						):
             SCREAMING_SNAKE_CASE__								=x.pop("""a"""						)
         with self.assertRaises(_UpperCamelCase						):
             SCREAMING_SNAKE_CASE__								=x.setdefault("""d"""				,3_2						)




     def   __A				(	self			: int						)		->   List[Any]:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0						)
         SCREAMING_SNAKE_CASE__								=1_0
         self.assertEqual(x.a				,1_0						)
         self.assertEqual(x["""a"""]				,1_0						)




     def   __A				(	self			: Union[str, Any]						)		->   Optional[Any]:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=3_0						)
         SCREAMING_SNAKE_CASE__								=1_0
         self.assertEqual(x.a				,1_0						)
         self.assertEqual(x["""a"""]				,1_0						)




     def   __A				(	self			: Dict						)		->   List[str]:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=ModelOutputTest({"""a""": 3_0, """b""": 1_0}						)
         self.assertEqual(list(x.keys()						)				,["""a""", """b"""]						)
         self.assertEqual(x.a				,3_0						)
         self.assertEqual(x.b				,1_0						)




     def   __A				(	self			: Optional[int]						)		->   int:


         '''simple docstring'''





         SCREAMING_SNAKE_CASE__								=ModelOutputTest([("""a""", 3_0), ("""b""", 1_0)]						)
         self.assertEqual(list(x.keys()						)				,["""a""", """b"""]						)
         self.assertEqual(x.a				,3_0						)
         self.assertEqual(x.b				,1_0						)

         with self.assertRaises(_UpperCamelCase						):
             SCREAMING_SNAKE_CASE__								=ModelOutputTest([("""a""", 3_0), (1_0, 1_0)]						)

         SCREAMING_SNAKE_CASE__								=ModelOutputTest(a=(3_0, 3_0)						)
         self.assertEqual(list(x.keys()						)				,["""a"""]						)
         self.assertEqual(x.a				,(3_0, 3_0)						)






