code: def _open(self):
          
          self._sample = None
  
          formatting_parameters0 = {'encoding':        'auto',
                                    'delimiter':       'auto',
                                    'line_terminator': 'auto',
                                    'escape_char':     '\\',
                                    'quote_char':      '"'}
          formatting_parameters1 = self._helper.pass1(self._filename, formatting_parameters0)
          self._formatting_parameters = formatting_parameters1
  
          # Detect encoding.
          if formatting_parameters1['encoding'] == 'auto':
              self._get_sample('rb', None)
              self._detect_encoding()
  
          # Detect delimiter.
          if formatting_parameters1['delimiter'] == 'auto':
              self._get_sample('rt', formatting_parameters1['encoding'])
              self._detect_delimiter()
  
          # Detect line terminators.
          if formatting_parameters1['line_terminator'] == 'auto':
              if not self._sample:
                  self._get_sample('rt', formatting_parameters1['encoding'])
              self._detect_line_ending()
  
          self._formatting_parameters = self._helper.pass2(self._filename,
                                                           self._formatting_parameters,
                                                           formatting_parameters1)
  
          self._open_file('rt', formatting_parameters1['encoding'])
          self._csv_reader = csv.reader(self._file,
                                        delimiter=self._formatting_parameters['delimiter'],
                                        escapechar=self._formatting_parameters['escape_char'],
                                        lineterminator=self._formatting_parameters['line_terminator'],
                                        quotechar=self._formatting_parameters['quote_char'])  # Ignored
  
          self._sample = None
docs: Opens the next current file with proper settings for encoding and delimiter.