

'''simple docstring'''


from __future__ import annotations

from collections.abc import Iterator
from typing import Any




class      a      :






						"""simple docstring"""




						def __init__(				self       :   Dict      ,      snake_case_       :   Optional[Any]	):



								'''simple docstring'''



								snake_case__    :							Any							    =	data
								snake_case__    :							Node | None							    =	None





class      a      :






						"""simple docstring"""




						def __init__(				self       :   Optional[Any]	):



								'''simple docstring'''



								snake_case__    :							Tuple							    =	None
								snake_case__    :							Any							    =	None







						def __iter__(				self       :   List[Any]	):



								'''simple docstring'''



								snake_case__    :							int							    =	self.head
								while self.head:
										yield node.data
										snake_case__    :							List[str]							    =	node.next
										if node == self.head:
												break







						def __len__(				self       :   int	):



								'''simple docstring'''



								return sum(1 for _ in self	)







						def __repr__(				self       :   str	):



								'''simple docstring'''



								return "->".join(str(snake_case_	) for item in iter(self	)	)







						def    __magic_name__				(				self       :   Tuple      ,      snake_case_       :   Optional[int]	):



								'''simple docstring'''



								self.insert_nth(len(self	)      ,      snake_case_	)







						def    __magic_name__				(				self       :   Dict      ,      snake_case_       :   Tuple	):



								'''simple docstring'''



								self.insert_nth(0      ,      snake_case_	)







						def    __magic_name__				(				self       :   Union[str, Any]      ,      snake_case_       :   int      ,      snake_case_       :   Dict	):



								'''simple docstring'''



								if index < 0 or index > len(self	):
										raise IndexError('''list index out of range.'''	)
								snake_case__    :							Optional[Any]							    =	Node(snake_case_	)
								if self.head is None:
										snake_case__    :							Union[str, Any]							    =	new_node  # first node points itself
										snake_case__    :							int							    =	new_node
								elif index == 0:  # insert at head
										snake_case__    :							int							    =	self.head
										snake_case__    :							int							    =	new_node
								else:
										snake_case__    :							Any							    =	self.head
										for _ in range(index - 1	):
												snake_case__    :							Any							    =	temp.next
										snake_case__    :							Union[str, Any]							    =	temp.next
										snake_case__    :							Tuple							    =	new_node
										if index == len(self	) - 1:  # insert at tail
												snake_case__    :							Any							    =	new_node







						def    __magic_name__				(				self       :   Union[str, Any]	):



								'''simple docstring'''



								return self.delete_nth(0	)







						def    __magic_name__				(				self       :   List[str]	):



								'''simple docstring'''



								return self.delete_nth(len(self	) - 1	)







						def    __magic_name__				(				self       :   Optional[int]      ,      snake_case_       :   Optional[Any] = 0	):



								'''simple docstring'''



								if not 0 <= index < len(self	):
										raise IndexError('''list index out of range.'''	)
								snake_case__    :							Any							    =	self.head
								if self.head == self.tail:  # just one node
										snake_case__    :							Any							    =	None
								elif index == 0:  # delete head node
										snake_case__    :							Union[str, Any]							    =	self.tail.next.next
										snake_case__    :							Any							    =	self.head.next
								else:
										snake_case__    :							str							    =	self.head
										for _ in range(index - 1	):
												snake_case__    :							int							    =	temp.next
										snake_case__    :							List[str]							    =	temp.next
										snake_case__    :							Union[str, Any]							    =	temp.next.next
										if index == len(self	) - 1:  # delete at tail
												snake_case__    :							int							    =	temp
								return delete_node.data







						def    __magic_name__				(				self       :   Dict	):



								'''simple docstring'''



								return len(self	) == 0





def 						_a							(					):

		"""simple docstring"""

		snake_case__    :							str							    =	CircularLinkedList()
		assert len(__a  ) == 0
		assert circular_linked_list.is_empty() is True
		assert str(__a  ) == ""

		try:
				circular_linked_list.delete_front()
				raise AssertionError  # This should not happen
		except IndexError:
				assert True  # This should happen

		try:
				circular_linked_list.delete_tail()
				raise AssertionError  # This should not happen
		except IndexError:
				assert True  # This should happen

		try:
				circular_linked_list.delete_nth(-1  )
				raise AssertionError
		except IndexError:
				assert True

		try:
				circular_linked_list.delete_nth(0  )
				raise AssertionError
		except IndexError:
				assert True

		assert circular_linked_list.is_empty() is True
		for i in range(5  ):
				assert len(__a  ) == i
				circular_linked_list.insert_nth(__a ,				i + 1  )
		assert str(__a  ) == "->".join(str(__a  ) for i in range(1 ,				6  )  )

		circular_linked_list.insert_tail(6  )
		assert str(__a  ) == "->".join(str(__a  ) for i in range(1 ,				7  )  )
		circular_linked_list.insert_head(0  )
		assert str(__a  ) == "->".join(str(__a  ) for i in range(0 ,				7  )  )

		assert circular_linked_list.delete_front() == 0
		assert circular_linked_list.delete_tail() == 6
		assert str(__a  ) == "->".join(str(__a  ) for i in range(1 ,				6  )  )
		assert circular_linked_list.delete_nth(2  ) == 3

		circular_linked_list.insert_nth(2 ,				3  )
		assert str(__a  ) == "->".join(str(__a  ) for i in range(1 ,				6  )  )

		assert circular_linked_list.is_empty() is False


if __name__ == "__main__":
					import doctest

					doctest.testmod()








"""simple docstring"""







# Lint as: python3
import itertools
import os
import re


a_							=    re.compile(r"""([A-Z]+)([A-Z][a-z])""")
a_							=    re.compile(r"""([a-z\d])([A-Z])""")

a_							=    re.compile(r"""(?<!_)_(?!_)""")
a_							=    re.compile(r"""(_{2,})""")

a_							=    r"""^\w+(\.\w+)*$"""

a_							=    r"""<>:/\|?*"""

def     UpperCAmelCase_					(				__a   :			Optional[int]						):




			'''simple docstring'''



			_lowerCamelCase					:					str	       =    _uppercase_uppercase_re.sub(r'\1_\2'      ,							__a						)
			_lowerCamelCase					:					Tuple	       =    _lowercase_uppercase_re.sub(r'\1_\2'      ,							__a						)
			return name.lower()

def     UpperCAmelCase_					(				__a   :			Optional[int]						):




			'''simple docstring'''



			_lowerCamelCase					:					Dict	       =    _single_underscore_re.split(__a						)
			_lowerCamelCase					:					Tuple	       =    [_multiple_underscores_re.split(__a						) for n in name]
			return "".join(n.capitalize() for n in itertools.chain.from_iterable(__a						) if n != ''						)

def     UpperCAmelCase_					(				__a   :			List[Any]						):




			'''simple docstring'''



			if os.path.basename(__a						) != name:
						raise ValueError(f"Should be a dataset name, not a path: {name}"						)
			return camelcase_to_snakecase(__a						)

def     UpperCAmelCase_					(				__a   :			Union[str, Any]      ,							__a   :			Optional[int]						):




			'''simple docstring'''



			if os.path.basename(__a						) != name:
						raise ValueError(f"Should be a dataset name, not a path: {name}"						)
			if not re.match(_split_re      ,							__a						):
						raise ValueError(f"Split name should match '{_split_re}'' but got '{split}'."						)
			return f"{filename_prefix_for_name(__a						)}-{split}"

def     UpperCAmelCase_					(				__a   :			Any      ,							__a   :			Union[str, Any]      ,							__a   :			List[Any]      ,							__a   :			List[str]=None						):




			'''simple docstring'''



			_lowerCamelCase					:					List[Any]	       =    filename_prefix_for_split(__a      ,							__a						)
			if filetype_suffix:
						prefix += f".{filetype_suffix}"
			_lowerCamelCase					:					List[str]	       =    os.path.join(__a      ,							__a						)
			return f"{filepath}*"



def     UpperCAmelCase_					(				__a   :			str      ,							__a   :			List[Any]      ,							__a   :			List[str]      ,							__a   :			Tuple=None      ,							__a   :			Tuple=None						):




			'''simple docstring'''



			_lowerCamelCase					:					Tuple	       =    filename_prefix_for_split(__a      ,							__a						)
			_lowerCamelCase					:					List[str]	       =    os.path.join(__a      ,							__a						)

			if shard_lengths:
						_lowerCamelCase					:					Union[str, Any]	       =    len(__a						)
						_lowerCamelCase					:					str	       =    [f"{prefix}-{shard_id:05d}-of-{num_shards:05d}" for shard_id in range(__a						)]
						if filetype_suffix:
									_lowerCamelCase					:					int	       =    [filename + f".{filetype_suffix}" for filename in filenames]
						return filenames
			else:
						_lowerCamelCase					:					int	       =    prefix
						if filetype_suffix:
									filename += f".{filetype_suffix}"
						return [filename]





