# xarray.CFTimeIndex.append

#### CFTimeIndex.append(other)[[source]](https://github.com/pydata/xarray/blob/main/xarray/../.pixi/envs/doc/lib/python3.15/site-packages/pandas/core/indexes/base.py#L5760-L5805)

Append a collection of Index options together.

This method concatenates one or more Index objects to the current
index, returning a new Index containing all elements in order.

* **Parameters:**
  **other** ([`Index`](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Index.html#pandas.Index) or `list/tuple` of `indices`) – Single Index or a collection of indices, which can be either a list or a
  tuple.
* **Returns:**
  [`Index`](https://pandas.pydata.org/pandas-docs/stable/reference/api/pandas.Index.html#pandas.Index) – Returns a new Index object resulting from appending the provided other
  indices to the original Index.

#### SEE ALSO
`Index.insert`
: Make new Index inserting new item at location.

### Examples

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```pycon
>>> idx = pd.Index([1, 2, 3])
>>> idx.append(pd.Index([4]))
Index([1, 2, 3, 4], dtype='int64')
```

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