text: """Helper class to quickly write a loop over all standard input files.
  
  Typical use is:
  
      import fileinput
      for line in fileinput.input():
          process(line)
  
  This iterates over the lines of all files listed in sys.argv[1:],
  defaulting to sys.stdin if the list is empty.  If a filename is '-' it
  is also replaced by sys.stdin.  To specify an alternative list of
  filenames, pass it as the argument to input().  A single file name is
  also allowed.
  
  Functions filename(), lineno() return the filename and cumulative line
  number of the line that has just been read; filelineno() returns its
  line number in the current file; isfirstline() returns true iff the
  line just read is the first line of its file; isstdin() returns true
  iff the line was read from sys.stdin.  Function nextfile() closes the
  current file so that the next iteration will read the first line from
  the next file (if any); lines not read from the file will not count
  towards the cumulative line count; the filename is not changed until
  after the first line of the next file has been read.  Function close()
  closes the sequence.
  
  Before any lines have been read, filename() returns None and both line
  numbers are zero; nextfile() has no effect.  After all lines have been
  read, filename() and the line number functions return the values
  pertaining to the last line read; nextfile() has no effect.
  
  All files are opened in text mode by default, you can override this by
  setting the mode parameter to input() or FileInput.__init__().
  If an I/O error occurs during opening or reading a file, the OSError
  exception is raised.
  
  If sys.stdin is used more than once, the second and further use will
  return no lines, except perhaps for interactive use, or if it has been
  explicitly reset (e.g. using sys.stdin.seek(0)).
  
  Empty files are opened and immediately closed; the only time their
  presence in the list of filenames is noticeable at all is when the
  last file opened is empty.
  
  It is possible that the last line of a file doesn't end in a newline
  character; otherwise lines are returned including the trailing
  newline.
  
  Class FileInput is the implementation; its methods filename(),
  lineno(), fileline(), isfirstline(), isstdin(), nextfile() and close()
  correspond to the functions in the module.  In addition it has a
  readline() method which returns the next input line, and a
  __getitem__() method which implements the sequence behavior.  The
  sequence must be accessed in strictly sequential order; sequence
  access and readline() cannot be mixed.
  
  Optional in-place filtering: if the keyword argument inplace=1 is
  passed to input() or to the FileInput constructor, the file is moved
  to a backup file and standard output is directed to the input file.
  This makes it possible to write a filter that rewrites its input file
  in place.  If the keyword argument backup=".<some extension>" is also
  given, it specifies the extension for the backup file, and the backup
  file remains around; by default, the extension is ".bak" and it is
  deleted when the output file is closed.  In-place filtering is
  disabled when standard input is read.  XXX The current implementation
  does not work for MS-DOS 8+3 filesystems.
  
  XXX Possible additions:
  
  - optional getopt argument processing
  - isatty()
  - read(), read(size), even readlines()
  
  """
  
  import sys, os
  
  __all__ = ["input", "close", "nextfile", "filename", "lineno", "filelineno",
             "isfirstline", "isstdin", "FileInput"]
  
  _state = None
  
  # No longer used
  DEFAULT_BUFSIZE = 8*1024
  
  def input(files=None, inplace=False, backup="", bufsize=0,
            mode="r", openhook=None):
      """Return an instance of the FileInput class, which can be iterated.
  
      The parameters are passed to the constructor of the FileInput class.
      The returned instance, in addition to being an iterator,
      keeps global state for the functions of this module,.
      """
      global _state
      if _state and _state._file:
          raise RuntimeError("input() already active")
      _state = FileInput(files, inplace, backup, bufsize, mode, openhook)
      return _state
  
  def close():
      """Close the sequence."""
      global _state
      state = _state
      _state = None
      if state:
          state.close()
  
  def nextfile():
      """
      Close the current file so that the next iteration will read the first
      line from the next file (if any); lines not read from the file will
      not count towards the cumulative line count. The filename is not
      changed until after the first line of the next file has been read.
      Before the first line has been read, this function has no effect;
      it cannot be used to skip the first file. After the last line of the
      last file has been read, this function has no effect.
      """
      if not _state:
          raise RuntimeError("no active input()")
      return _state.nextfile()
  
  def filename():
      """
      Return the name of the file currently being read.
      Before the first line has been read, returns None.
      """
      if not _state:
          raise RuntimeError("no active input()")
      return _state.filename()
  
  def lineno():
      """
      Return the cumulative line number of the line that has just been read.
      Before the first line has been read, returns 0. After the last line
      of the last file has been read, returns the line number of that line.
      """
      if not _state:
          raise RuntimeError("no active input()")
      return _state.lineno()
  
  def filelineno():
      """
      Return the line number in the current file. Before the first line
      has been read, returns 0. After the last line of the last file has
      been read, returns the line number of that line within the file.
      """
      if not _state:
          raise RuntimeError("no active input()")
      return _state.filelineno()
  
  def fileno():
      """
      Return the file number of the current file. When no file is currently
      opened, returns -1.
      """
      if not _state:
          raise RuntimeError("no active input()")
      return _state.fileno()
  
  def isfirstline():
      """
      Returns true the line just read is the first line of its file,
      otherwise returns false.
      """
      if not _state:
          raise RuntimeError("no active input()")
      return _state.isfirstline()
  
  def isstdin():
      """
      Returns true if the last line was read from sys.stdin,
      otherwise returns false.
      """
      if not _state:
          raise RuntimeError("no active input()")
      return _state.isstdin()
  
  class FileInput:
      """FileInput([files[, inplace[, backup[, bufsize, [, mode[, openhook]]]]]])
  
      Class FileInput is the implementation of the module; its methods
      filename(), lineno(), fileline(), isfirstline(), isstdin(), fileno(),
      nextfile() and close() correspond to the functions of the same name
      in the module.
      In addition it has a readline() method which returns the next
      input line, and a __getitem__() method which implements the
      sequence behavior. The sequence must be accessed in strictly
      sequential order; random access and readline() cannot be mixed.
      """
  
      def __init__(self, files=None, inplace=False, backup="", bufsize=0,
                   mode="r", openhook=None):
          if isinstance(files, str):
              files = (files,)
          else:
              if files is None:
                  files = sys.argv[1:]
              if not files:
                  files = ('-',)
              else:
                  files = tuple(files)
          self._files = files
          self._inplace = inplace
          self._backup = backup
          self._savestdout = None
          self._output = None
          self._filename = None
          self._startlineno = 0
          self._filelineno = 0
          self._file = None
          self._isstdin = False
          self._backupfilename = None
          # restrict mode argument to reading modes
          if mode not in ('r', 'rU', 'U', 'rb'):
              raise ValueError("FileInput opening mode must be one of "
                               "'r', 'rU', 'U' and 'rb'")
          if 'U' in mode:
              import warnings
              warnings.warn("'U' mode is deprecated",
                            DeprecationWarning, 2)
          self._mode = mode
          if openhook:
              if inplace:
                  raise ValueError("FileInput cannot use an opening hook in inplace mode")
              if not callable(openhook):
                  raise ValueError("FileInput openhook must be callable")
          self._openhook = openhook
  
      def __del__(self):
          self.close()
  
      def close(self):
          try:
              self.nextfile()
          finally:
              self._files = ()
  
      def __enter__(self):
          return self
  
      def __exit__(self, type, value, traceback):
          self.close()
  
      def __iter__(self):
          return self
  
      def __next__(self):
          while True:
              line = self._readline()
              if line:
                  self._filelineno += 1
                  return line
              if not self._file:
                  raise StopIteration
              self.nextfile()
              # repeat with next file
  
      def __getitem__(self, i):
          if i != self.lineno():
              raise RuntimeError("accessing lines out of order")
          try:
              return self.__next__()
          except StopIteration:
              raise IndexError("end of input reached")
  
      def nextfile(self):
          savestdout = self._savestdout
          self._savestdout = None
          if savestdout:
              sys.stdout = savestdout
  
          output = self._output
          self._output = None
          try:
              if output:
                  output.close()
          finally:
              file = self._file
              self._file = None
              try:
                  del self._readline  # restore FileInput._readline
              except AttributeError:
                  pass
              try:
                  if file and not self._isstdin:
                      file.close()
              finally:
                  backupfilename = self._backupfilename
                  self._backupfilename = None
                  if backupfilename and not self._backup:
                      try: os.unlink(backupfilename)
                      except OSError: pass
  
                  self._isstdin = False
  
      def readline(self):
          while True:
              line = self._readline()
              if line:
                  self._filelineno += 1
                  return line
              if not self._file:
                  return line
              self.nextfile()
              # repeat with next file
  
      def _readline(self):
          if not self._files:
              if 'b' in self._mode:
                  return b''
              else:
                  return ''
          self._filename = self._files[0]
          self._files = self._files[1:]
          self._startlineno = self.lineno()
          self._filelineno = 0
          self._file = None
          self._isstdin = False
          self._backupfilename = 0
          if self._filename == '-':
              self._filename = '<stdin>'
              if 'b' in self._mode:
                  self._file = getattr(sys.stdin, 'buffer', sys.stdin)
              else:
                  self._file = sys.stdin
              self._isstdin = True
          else:
              if self._inplace:
                  self._backupfilename = (
                      self._filename + (self._backup or ".bak"))
                  try:
                      os.unlink(self._backupfilename)
                  except OSError:
                      pass
                  # The next few lines may raise OSError
                  os.rename(self._filename, self._backupfilename)
                  self._file = open(self._backupfilename, self._mode)
                  try:
                      perm = os.fstat(self._file.fileno()).st_mode
                  except OSError:
                      self._output = open(self._filename, "w")
                  else:
                      mode = os.O_CREAT | os.O_WRONLY | os.O_TRUNC
                      if hasattr(os, 'O_BINARY'):
                          mode |= os.O_BINARY
  
                      fd = os.open(self._filename, mode, perm)
                      self._output = os.fdopen(fd, "w")
                      try:
                          if hasattr(os, 'chmod'):
                              os.chmod(self._filename, perm)
                      except OSError:
                          pass
                  self._savestdout = sys.stdout
                  sys.stdout = self._output
              else:
                  # This may raise OSError
                  if self._openhook:
                      self._file = self._openhook(self._filename, self._mode)
                  else:
                      self._file = open(self._filename, self._mode)
          self._readline = self._file.readline  # hide FileInput._readline
          return self._readline()
  
      def filename(self):
          return self._filename
  
      def lineno(self):
          return self._startlineno + self._filelineno
  
      def filelineno(self):
          return self._filelineno
  
      def fileno(self):
          if self._file:
              try:
                  return self._file.fileno()
              except ValueError:
                  return -1
          else:
              return -1
  
      def isfirstline(self):
          return self._filelineno == 1
  
      def isstdin(self):
          return self._isstdin
  
  
  def hook_compressed(filename, mode):
      ext = os.path.splitext(filename)[1]
      if ext == '.gz':
          import gzip
          return gzip.open(filename, mode)
      elif ext == '.bz2':
          import bz2
          return bz2.BZ2File(filename, mode)
      else:
          return open(filename, mode)
  
  
  def hook_encoded(encoding):
      def openhook(filename, mode):
          return open(filename, mode, encoding=encoding)
      return openhook
  
  
  def _test():
      import getopt
      inplace = False
      backup = False
      opts, args = getopt.getopt(sys.argv[1:], "ib:")
      for o, a in opts:
          if o == '-i': inplace = True
          if o == '-b': backup = a
      for line in input(args, inplace=inplace, backup=backup):
          if line[-1:] == '\n': line = line[:-1]
          if line[-1:] == '\r': line = line[:-1]
          print("%d: %s[%d]%s %s" % (lineno(), filename(), filelineno(),
                                     isfirstline() and "*" or "", line))
      print("%d: %s[%d]" % (lineno(), filename(), filelineno()))
  
  if __name__ == '__main__':
      _test()
  