Method safe_string_lower

python/ccxt/base/exchange.py:775–782

(dictionary, key, default_value=None)

    @staticmethod
    def safe_string_lower(dictionary, key, default_value=None):
        try:
            value = dictionary[key]
            if value is not None and value != '':
                return str(value).lower()
        except Exception:
            pass
        return default_value.lower() if default_value is not None else default_value

    @staticmethod
    def safe_string_upper(dictionary, key, default_value=None):