






"""simple docstring"""







import logging
import os
import threading
import time


try:
 import warnings
except ImportError:
 __a       :	List[str]             = None

try:
 import msvcrt
except ImportError:
 __a       :	Optional[int]             = None

try:
 import fcntl
except ImportError:
 __a       :	List[Any]             = None


# Backward compatibility
# ------------------------------------------------
try:
 TimeoutError
except NameError:
 __a       :	Tuple             = OSError


# Data
# ------------------------------------------------
__a       :	int             = [
    'Timeout',
    'BaseFileLock',
    'WindowsFileLock',
    'UnixFileLock',
    'SoftFileLock',
    'FileLock',
]

__a       :	Any             = '3.0.12'


__a       :	List[str]             = None





def        SCREAMING_SNAKE_CASE       (      ):
     global _logger
     a__          =  _logger or logging.getLogger(__name__)
     return _logger







class        _SCREAMING_SNAKE_CASE						(  __snake_case							):





       """simple docstring"""





       def __init__(   self:     Union[str, Any]				,		__A:     int    ):

            '''simple docstring'''

            a__          =  lock_file
            return None





       def __str__(   self:     Tuple    ):

            '''simple docstring'''

            a__          =  F'The file lock \'{self.lock_file}\' could not be acquired.'
            return temp







class        _SCREAMING_SNAKE_CASE						:





       """simple docstring"""





       def __init__(   self:     Optional[int]				,		__A:     Optional[Any]    ):

            '''simple docstring'''

            a__          =  lock
            return None




       def __enter__(   self:     Optional[int]    ):

            '''simple docstring'''

            return self.lock





       def __exit__(   self:     Optional[int]				,		__A:     List[Any]				,		__A:     Optional[Any]				,		__A:     int    ):

            '''simple docstring'''

            self.lock.release()
            return None







class        _SCREAMING_SNAKE_CASE						:





       """simple docstring"""





       def __init__(   self:     Tuple				,		__A:     Union[str, Any]				,		__A:     List[Any]=-1				,		__A:     List[Any]=None    ):

            '''simple docstring'''

            a__          =  max_filename_length if max_filename_length is not None else 255
            # Hash the filename if it's too long
            a__          =  self.hash_filename_if_too_long(__A				,		__A    )
            # The path to the lock file.
            a__          =  lock_file

            # The file descriptor for the *_lock_file* as it is returned by the
            # os.open() function.
            # This file lock is only NOT None, if the object currently holds the
            # lock.
            a__          =  None

            # The default timeout value.
            a__          =  timeout

            # We use this lock primarily for the lock counter.
            a__          =  threading.Lock()

            # The lock counter is used for implementing the nested locking
            # mechanism. Whenever the lock is acquired, the counter is increased and
            # the lock is only released, when this value is 0 again.
            a__          =  0
            return None




       @property
       def  lowercase		(   self:     List[Any]    ):

            '''simple docstring'''

            return self._lock_file




       @property
       def  lowercase		(   self:     Any    ):

            '''simple docstring'''

            return self._timeout




       @timeout.setter
       def  lowercase		(   self:     Dict				,		__A:     Union[str, Any]    ):

            '''simple docstring'''

            a__          =  float(__A    )
            return None




       def  lowercase		(   self:     Any    ):

            '''simple docstring'''

            raise NotImplementedError()




       def  lowercase		(   self:     Tuple    ):

            '''simple docstring'''

            raise NotImplementedError()




       @property
       def  lowercase		(   self:     List[str]    ):

            '''simple docstring'''

            return self._lock_file_fd is not None




       def  lowercase		(   self:     Union[str, Any]				,		__A:     Any=None				,		__A:     int=0.0_5    ):

            '''simple docstring'''

            if timeout is None:
                 a__          =  self.timeout

            # Increment the number right at the beginning.
            # We can still undo it, if something fails.
            with self._thread_lock:
                 self._lock_counter += 1

            a__          =  id(self    )
            a__          =  self._lock_file
            a__          =  time.time()
            try:
                 while True:
                      with self._thread_lock:
                           if not self.is_locked:
                                logger().debug(F'Attempting to acquire lock {lock_id} on {lock_filename}'    )
                                self._acquire()

                      if self.is_locked:
                           logger().debug(F'Lock {lock_id} acquired on {lock_filename}'    )
                           break
                      elif timeout >= 0 and time.time() - start_time > timeout:
                           logger().debug(F'Timeout on acquiring lock {lock_id} on {lock_filename}'    )
                           raise Timeout(self._lock_file    )
                      else:
                           logger().debug(
                               F'Lock {lock_id} not acquired on {lock_filename}, waiting {poll_intervall} seconds ...'    )
                           time.sleep(__A    )
            except:  # noqa
                 # Something did go wrong, so decrement the counter.
                 with self._thread_lock:
                      a__          =  max(0				,		self._lock_counter - 1    )

                 raise
            return _Acquire_ReturnProxy(lock=self    )




       def  lowercase		(   self:     List[Any]				,		__A:     Optional[int]=False    ):

            '''simple docstring'''

            with self._thread_lock:
                 if self.is_locked:
                      self._lock_counter -= 1

                      if self._lock_counter == 0 or force:
                           a__          =  id(self    )
                           a__          =  self._lock_file

                           logger().debug(F'Attempting to release lock {lock_id} on {lock_filename}'    )
                           self._release()
                           a__          =  0
                           logger().debug(F'Lock {lock_id} released on {lock_filename}'    )

            return None




       def __enter__(   self:     Dict    ):

            '''simple docstring'''

            self.acquire()
            return self




       def __exit__(   self:     Tuple				,		__A:     Tuple				,		__A:     Optional[Any]				,		__A:     int    ):

            '''simple docstring'''

            self.release()
            return None




       def __del__(   self:     List[str]    ):

            '''simple docstring'''

            self.release(force=__A    )
            return None





       def  lowercase		(   self:     str				,		__A:     str				,		__A:     int    ):

            '''simple docstring'''

            a__          =  os.path.basename(__A    )
            if len(__A    ) > max_length and max_length > 0:
                 a__          =  os.path.dirname(__A    )
                 a__          =  str(hash(__A    )    )
                 a__          =  filename[: max_length - len(__A    ) - 8] + '''...''' + hashed_filename + '''.lock'''
                 return os.path.join(__A				,		__A    )
            else:
                 return path







class        _SCREAMING_SNAKE_CASE						(  __snake_case							):





       """simple docstring"""





       def __init__(   self:     List[str]				,		__A:     Union[str, Any]				,		__A:     Union[str, Any]=-1				,		__A:     Tuple=None    ):

            '''simple docstring'''

            from .file_utils import relative_to_absolute_path

            super().__init__(__A				,		timeout=__A				,		max_filename_length=__A    )
            a__          =  '''\\\\?\\''' + relative_to_absolute_path(self.lock_file    )




       def  lowercase		(   self:     Optional[int]    ):

            '''simple docstring'''

            a__          =  os.O_RDWR | os.O_CREAT | os.O_TRUNC

            try:
                 a__          =  os.open(self._lock_file				,		__A    )
            except OSError:
                 pass
            else:
                 try:
                      msvcrt.locking(__A				,		msvcrt.LK_NBLCK				,		1    )
                 except OSError:
                      os.close(__A    )
                 else:
                      a__          =  fd
            return None





       def  lowercase		(   self:     Any    ):

            '''simple docstring'''

            a__          =  self._lock_file_fd
            a__          =  None
            msvcrt.locking(__A				,		msvcrt.LK_UNLCK				,		1    )
            os.close(__A    )

            try:
                 os.remove(self._lock_file    )
            # Probably another instance of the application
            # that acquired the file lock.
            except OSError:
                 pass
            return None







class        _SCREAMING_SNAKE_CASE						(  __snake_case							):





       """simple docstring"""





       def __init__(   self:     Optional[int]				,		__A:     List[Any]				,		__A:     Dict=-1				,		__A:     Union[str, Any]=None    ):

            '''simple docstring'''

            a__          =  os.statvfs(os.path.dirname(__A    )    ).f_namemax
            super().__init__(__A				,		timeout=__A				,		max_filename_length=__A    )




       def  lowercase		(   self:     Any    ):

            '''simple docstring'''

            a__          =  os.O_RDWR | os.O_CREAT | os.O_TRUNC
            a__          =  os.open(self._lock_file				,		__A    )

            try:
                 fcntl.flock(__A				,		fcntl.LOCK_EX | fcntl.LOCK_NB    )
            except OSError:
                 os.close(__A    )
            else:
                 a__          =  fd
            return None





       def  lowercase		(   self:     List[Any]    ):

            '''simple docstring'''

            a__          =  self._lock_file_fd
            a__          =  None
            fcntl.flock(__A				,		fcntl.LOCK_UN    )
            os.close(__A    )
            return None







class        _SCREAMING_SNAKE_CASE						(  __snake_case							):





       """simple docstring"""





       def  lowercase		(   self:     Optional[Any]    ):

            '''simple docstring'''

            a__          =  os.O_WRONLY | os.O_CREAT | os.O_EXCL | os.O_TRUNC
            try:
                 a__          =  os.open(self._lock_file				,		__A    )
            except OSError:
                 pass
            else:
                 a__          =  fd
            return None





       def  lowercase		(   self:     Dict    ):

            '''simple docstring'''

            os.close(self._lock_file_fd    )
            a__          =  None

            try:
                 os.remove(self._lock_file    )
            # The file is already deleted and that's what we want.
            except OSError:
                 pass
            return None

__a       :	Optional[int]             = None

if msvcrt:
 __a       :	Union[str, Any]             = WindowsFileLock
elif fcntl:
 __a       :	Optional[int]             = UnixFileLock
else:
 __a       :	Any             = SoftFileLock

 if warnings is not None:
  warnings.warn('only soft file lock is available')










"""simple docstring"""







class        _SCREAMING_SNAKE_CASE						:





							"""simple docstring"""





							def __init__(   self:     Any    ):

												'''simple docstring'''

												a__          =  {}




							def  lowercase		(   self:     Optional[int]    ):

												'''simple docstring'''

												print(self.vertex    )
												for i in self.vertex:
																	print(__A				,		''' -> '''				,		''' -> '''.join([str(__A    ) for j in self.vertex[i]]    )    )




							def  lowercase		(   self:     Union[str, Any]				,		__A:     int				,		__A:     int    ):

												'''simple docstring'''

												if from_vertex in self.vertex:
																	self.vertex[from_vertex].append(__A    )
												else:
																	# else make a new vertex
																	a__          =  [to_vertex]




							def  lowercase		(   self:     Dict    ):

												'''simple docstring'''

												a__          =  [False] * len(self.vertex    )

												# call the recursive helper function
												for i in range(len(self.vertex    )    ):
																	if not visited[i]:
																						self.dfs_recursive(__A				,		__A    )





							def  lowercase		(   self:     Optional[int]				,		__A:     int				,		__A:     list    ):

												'''simple docstring'''

												a__          =  True

												print(__A				,		end=''' '''    )

												# Recur for all the vertices that are adjacent to this node
												for i in self.vertex:
																	if not visited[i]:
																						self.dfs_recursive(__A				,		__A    )


if __name__ == "__main__":
	__a       :	Any             = Graph()
	g.add_edge(0, 1)
	g.add_edge(0, 2)
	g.add_edge(1, 2)
	g.add_edge(2, 0)
	g.add_edge(2, 3)
	g.add_edge(3, 3)

	g.print_graph()
	print('DFS:')
	g.dfs()

	# OUTPUT:
	# 0  ->  1 -> 2
	# 1  ->  2
	# 2  ->  0 -> 3
	# 3  ->  3
	# DFS:
	#  0 1 2 3


