code: def write(self, filepath, validate=True, overwrite=False, mode=0o666):
          
          if not overwrite and os.path.exists(filepath):
              raise error.WriteError(errno.EEXIST, filepath)
  
          # Get file content before opening the file in case there are errors like
          # incomplete metainfo
          content = io.BytesIO()
          self.write_stream(content, validate=validate)
          content.seek(0)
          try:
              with open(filepath, 'wb') as f:
                  f.write(content.read())
          except OSError as e:
              raise error.WriteError(e.errno, filepath)
docs: Write :attr:`metainfo` to torrent file
  
          This method is essentially equivalent to:
  
          >>> with open('my.torrent', 'wb') as f:
          ...     f.write(torrent.dump())
  
          :param filepath: Path of the torrent file
          :param bool validate: Whether to run :meth:`validate` first
          :param bool overwrite: Whether to silently overwrite `filepath` (only
              if all pieces were hashed successfully)
          :param mode: File permissions of `filepath`
  
          :raises WriteError: if writing to `filepath` fails
          :raises MetainfoError: if `validate` is `True` and :attr:`metainfo`
              contains invalid data