code: def check_physical(self, line):
          
          self.physical_line = line
          if self.indent_char is None and len(line) and line[0] in ' \t':
              self.indent_char = line[0]
          for name, check, argument_names in self.physical_checks:
              result = self.run_check(check, argument_names)
              if result is not None:
                  offset, text = result
                  self.report_error(self.line_number, offset, text, check)
docs: Run all physical checks on a raw input line.