How to use the vulture.utils.read_file function in vulture

pattern = '*{pattern}*'.format(**locals())
            return pattern

        exclude = [prepare_pattern(pattern) for pattern in (exclude or [])]

        def exclude_file(name):
            return any(fnmatch(name, pattern) for pattern in exclude)

        for module in utils.get_modules(paths):
            if exclude_file(module):
                self._log('Excluded:', module)
                continue

            self._log('Scanning:', module)
            try:
                module_string = utils.read_file(module)
            except utils.VultureInputException as err:  # noqa: F841
                print(
                    'Error: Could not read file {module} - {err}\n'
                    'Try to change the encoding to UTF-8.'.format(**locals()),
                    file=sys.stderr)
                self.found_dead_code_or_error = True
            else:
                self.scan(module_string, filename=module)

        unique_imports = {item.name for item in self.defined_imports}
        for import_name in unique_imports:
            path = os.path.join('whitelists', import_name) + '_whitelist.py'
            if exclude_file(path):
                self._log('Excluded whitelist:', path)
            else:
                try: