code: def _parse_field_value(line):
      
      if line.startswith(':'):
          # Ignore the line
          return None, None
  
      if ':' not in line:
          # Treat the entire line as the field, use empty string as value
          return line, ''
  
      # Else field is before the ':' and value is after
      field, value = line.split(':', 1)
  
      # If value starts with a space, remove it.
      value = value[1:] if value.startswith(' ') else value
  
      return field, value
docs: Parse the field and value from a line.