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# Scripting support
Scripting support is limited to scripts that operate on keys in the same key slot.
If a script is executed via `evalsha`, `eval` or by calling the callable returned by
`register_script` and the keys passed as arguments do not map to the same key slot,
a `RedisClusterException` will be thrown.
It is however, possible to query a key within the script, that is not passed
as an argument of `eval`, `evalsha`. In this scenarios it is not possible to detect
the error early and redis itself will raise an error which will be percolated
to the user. For example:
```python
cluster = RedisCluster('localhost', 7000)
script = """
return redis.call('GET', KEYS[1]) * redis.call('GET', ARGV[1])
"""
# this will succeed
cluster.eval(script, 1, "A{Foo}", "A{Foo}")
# this will fail as "A{Foo}" and "A{Bar}" are on different key slots.
cluster.eval(script, 1, "A{Foo}", "A{Bar}")
```
## Unsupported operations
- The `SCRIPT KILL` command is not yet implemented.
- Scripting in the context of a pipeline is not yet implemented.
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