redis.set("key", 6)

assert redis.decrby("key", 4) == 2
If a key does not exist, it is initialized as 0 before performing the operation. An error is returned if the key contains a value of the wrong type or contains a string that can not be represented as integer.

​
Arguments

​
key
str
required
The key to decrement.
​
decrement
int
required
The amount to decrement by.

​
Response

The value at the key after the decrementing.
redis.set("key", 6)

assert redis.decrby("key", 4) == 2