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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:
 def localize_sql(self, sql: str) -> str: """Translates ?-placeholder SQL to appropriate dialect. For example, MySQLdb uses %s rather than ?. """

        # pyodbc seems happy with ? now (pyodbc.paramstyle is 'qmark');
        # using ? is much simpler, because we may want to use % with LIKE
        # fields or (in my case) with date formatting strings for
        # STR_TO_DATE().
        # If you get this wrong, you may see "not all arguments converted
        # during string formatting";
        # http://stackoverflow.com/questions/9337134
        if self.db_pythonlib in [PYTHONLIB_PYMYSQL, PYTHONLIB_MYSQLDB]:
            # These engines use %, so we need to convert ? to %, without
            # breaking literal % values.
            sql = _PERCENT_REGEX.sub("%%", sql)
            # ... replace all % with %% first
            sql = _QUERY_VALUE_REGEX.sub("%s", sql)
            # ... replace all ? with %s in the SQL
        # Otherwise: engine uses ?, so we don't have to fiddle.
        return sql