# RENAMENX

> Rename a key if it does not already exist.

Renames a key, only if the new key does not exist.

Throws an exception if the key does not exist.

## Arguments

<ParamField body="source" type="str" required>
  The original key.
</ParamField>


<ParamField body="destination" type="str" required>
  A new name for the key.
</ParamField>

## Response

<ResponseField type="bool" required>
 `True` if key was renamed
</ResponseField>

<RequestExample>
```py Example
redis.set("key1", "Hello")
redis.set("key2", "World")

# Rename failed because "key2" already exists.
assert redis.renamenx("key1", "key2") == False

assert redis.renamenx("key1", "key3") == True

assert redis.get("key1") is None
assert redis.get("key2") == "World"
assert redis.get("key3") == "Hello"
```
</RequestExample>