# xarray.Dataset.drop_duplicates

#### Dataset.drop_duplicates(dim, , keep='first')[[source]](https://github.com/pydata/xarray/blob/main/xarray/core/dataset.py#L10124-L10166)

Returns a new Dataset with duplicate dimension values removed.

* **Parameters:**
  * **dim** (`dimension label` or `labels`) – Pass … to drop duplicates along all dimensions.
  * **keep** (`{"first", "last", False}`, *default*: `"first"`) – Determines which duplicates (if any) to keep.
    - `"first"` : Drop duplicates except for the first occurrence.
    - `"last"` : Drop duplicates except for the last occurrence.
    - False : Drop all duplicates.
* **Returns:**
  [`Dataset`](xarray.Dataset.html.md#xarray.Dataset)

#### SEE ALSO
[`DataArray.drop_duplicates`](xarray.DataArray.drop_duplicates.html.md#xarray.DataArray.drop_duplicates)