Redis-py 2.x 升级至3.x 后出现数据类型错误

python业务代码会向redis存储带有布尔类型的字典，原始版本使用redis-py 2.x，新服务器升级至redis-py 3.2 后，出现报错：

DataError: Invalid input of type: 'bool'. Convert to a byte, string or number first.

查询redis-py官方文档，发现2.x升级至3.0后有较大更新，其中一条：

Encoding of User Input
redis-py 3.0 only accepts user data as bytes, strings or numbers (ints, longs and floats). Attempting to specify a key or a value as any other type will raise a DataError exception.

redis-py 2.X attempted to coerce any type of input into a string. While occasionally convenient, this caused all sorts of hidden errors when users passed boolean values (which were coerced to ‘True’ or ‘False’), a None value (which was coerced to ‘None’) or other values, such as user defined types.

All 2.X users should make sure that the keys and values they pass into redis-py are either bytes, strings or numbers.

用户应确保存入的key，value必须是bytes，string或者number三种类型，如果有布尔类型、None类型或者其他用户自定义类型，必须显式转换为上述三种合法类型再存入redis，否则会报错。

解决办法：

1. 服务器环境限制redis-py为2.x版本
2. 改进业务代码，将字典数据显式转换为字符串，避免以后出现潜在问题（推荐）