


from collections import OrderedDict
from dataclasses import fields
from typing import Any, Tuple

import numpy as np

from .import_utils import is_torch_available







def   lowerCamelCase(      a__):
				if is_torch_available():
								import torch

								if isinstance(a__		,torch.Tensor):
												return True

				return isinstance(a__		,np.ndarray)


class   A__							(						UpperCamelCase__     ):




						def 							__UpperCamelCase (				self    :					List[str]     )							->   List[str]:


										"""simple docstring"""





										_SCREAMING_SNAKE_CASE	     =fields(self     )

										# Safety and consistency checks
										if not len(_a     ):
														raise ValueError(f"{self.__class__.__name__} has no fields."     )

										_SCREAMING_SNAKE_CASE	     =getattr(self ,			class_fields[0].name     )
										_SCREAMING_SNAKE_CASE	     =all(getattr(self ,			field.name     ) is None for field in class_fields[1:]     )

										if other_fields_are_none and isinstance(_a ,			_a     ):
														for key, value in first_field.items():
																		_SCREAMING_SNAKE_CASE	     =value
										else:
														for field in class_fields:
																		_SCREAMING_SNAKE_CASE	     =getattr(self ,			field.name     )
																		if v is not None:
																						_SCREAMING_SNAKE_CASE	     =v




						def __delitem__(				self    :					Tuple ,			*_a    :					List[Any] ,			**_a    :					Dict     )							->   int:


										"""simple docstring"""





										raise Exception(f"You cannot use ``__delitem__`` on a {self.__class__.__name__} instance."     )




						def 							__UpperCamelCase (				self    :					int ,			*_a    :					int ,			**_a    :					List[str]     )							->   Optional[Any]:


										"""simple docstring"""





										raise Exception(f"You cannot use ``setdefault`` on a {self.__class__.__name__} instance."     )




						def 							__UpperCamelCase (				self    :					Any ,			*_a    :					Union[str, Any] ,			**_a    :					Tuple     )							->   int:


										"""simple docstring"""





										raise Exception(f"You cannot use ``pop`` on a {self.__class__.__name__} instance."     )




						def 							__UpperCamelCase (				self    :					Any ,			*_a    :					Union[str, Any] ,			**_a    :					Any     )							->   Optional[int]:


										"""simple docstring"""





										raise Exception(f"You cannot use ``update`` on a {self.__class__.__name__} instance."     )




						def __getitem__(				self    :					Tuple ,			_a    :					Optional[int]     )							->   List[Any]:


										"""simple docstring"""





										if isinstance(_a ,			_a     ):
														_SCREAMING_SNAKE_CASE	     =dict(self.items()     )
														return inner_dict[k]
										else:
														return self.to_tuple()[k]




						def __setattr__(				self    :					Dict ,			_a    :					Union[str, Any] ,			_a    :					str     )							->   Optional[Any]:


										"""simple docstring"""





										if name in self.keys() and value is not None:
														# Don't call self.__setitem__ to avoid recursion errors
														super().__setitem__(_a ,			_a     )
										super().__setattr__(_a ,			_a     )




						def __setitem__(				self    :					List[Any] ,			_a    :					List[str] ,			_a    :					str     )							->   Dict:


										"""simple docstring"""





										super().__setitem__(_a ,			_a     )
										# Don't call self.__setattr__ to avoid recursion errors
										super().__setattr__(_a ,			_a     )




						def 							__UpperCamelCase (				self    :					Dict     )							->   Tuple[Any]:


										"""simple docstring"""





										return tuple(self[k] for k in self.keys()     )





from __future__ import annotations

from typing import Generic, TypeVar

UpperCamelCase								=     TypeVar('T')





class  __lowerCamelCase       (    Generic[T]    ):




    """simple docstring"""

    def __init__(       self     :     List[str]   ,	SCREAMING_SNAKE_CASE__     :     T   )      ->       List[Any]:
         lowerCAmelCase__		= data  # Assign data
         lowerCAmelCase__		= None  # Initialize next as null
         lowerCAmelCase__		= None  # Initialize prev as null






class  __lowerCamelCase       (    Generic[T]    ):




    """simple docstring"""

    def __init__(       self     :     Any   )      ->       None:
         lowerCAmelCase__		= None


    def    a      (       self     :     Tuple   ,	SCREAMING_SNAKE_CASE__     :     T   )      ->       None:
         if self.head is None:
              lowerCAmelCase__		= Node(SCREAMING_SNAKE_CASE__   )
         else:
              lowerCAmelCase__		= Node(SCREAMING_SNAKE_CASE__   )
              lowerCAmelCase__		= new_node
              lowerCAmelCase__		= self.head
              lowerCAmelCase__		= None
              lowerCAmelCase__		= new_node


    def    a      (       self     :     int   )      ->       T | None:
         if self.head is None:
              return None
         else:
              assert self.head is not None
              lowerCAmelCase__		= self.head.data
              lowerCAmelCase__		= self.head.next
              if self.head is not None:
                   lowerCAmelCase__		= None
              return temp


    def    a      (       self     :     int   )      ->       T | None:
         return self.head.data if self.head is not None else None


    def __len__(       self     :     List[str]   )      ->       int:
         lowerCAmelCase__		= self.head
         lowerCAmelCase__		= 0
         while temp is not None:
              count += 1
              lowerCAmelCase__		= temp.next
         return count


    def    a      (       self     :     Tuple   )      ->       bool:
         return self.head is None


    def    a      (       self     :     Dict   )      ->       None:
         print("stack elements are:"   )
         lowerCAmelCase__		= self.head
         while temp is not None:
              print(temp.data   ,	end="->"   )
              lowerCAmelCase__		= 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())
