> ## Documentation Index
> Fetch the complete documentation index at: https://upstash.com/docs/llms.txt
> Use this file to discover all available pages before exploring further.

# ZDIFF

> Returns the difference between sets.

## Arguments

<ParamField body="keys" type="List[str]" required>
  The keys of the sets to compare.
</ParamField>

<ParamField body="withscores" type="bool" default="false">
  Whether to include scores in the result.
</ParamField>

## Response

<ResponseField type="List[str] | List[Tuple[str, float]]">
  The number of elements in the resulting set.
</ResponseField>

<RequestExample>
  ```py Simple theme={"system"}
  redis.zadd("key1", {"a": 1, "b": 2, "c": 3})

  redis.zadd("key2", {"c": 3, "d": 4, "e": 5})

  result = redis.zdiff(["key1", "key2"])

  assert result == ["a", "b"]
  ```

  ```py With scores theme={"system"}
  redis.zadd("key1", {"a": 1, "b": 2, "c": 3})

  redis.zadd("key2", {"c": 3, "d": 4, "e": 5})

  result = redis.zdiff(["key1", "key2"], withscores=True)

  assert result == [("a", 1), ("b", 2)]
  ```
</RequestExample>