---
metadata:
  - name: generator
    content: Diplodoc Platform v5.50.3
alternate:
  - https://catboost.ai/docs/en/concepts/python-reference_pool_get_group_id.md
---
> **Documentation Index:** Fetch the complete configuration index at https://catboost.ai/docs/en/llms.txt

# get_group_id

<!-- source: en/_includes/work_src/reusage-python/get_group_id__desc.md -->
Return an array of group identifiers for all objects.
<!-- endsource: en/_includes/work_src/reusage-python/get_group_id__desc.md -->


## Method call format {#call-format}

```python
get_group_id()
```

## Type of return value {#output-format}

list

## Example {#example}

```python
from catboost import Pool

train_data = [[75, 'today', 5, 4, 3],
              [76, 'blvd', 4, 5, 7],
              [70, 'letters', 0, 3, 4],
              [60, 'back', 9, 0, 1]]

label_values = [0, 1, 0, 4]

input_pool = Pool(data=train_data,
                  label=label_values,
                  cat_features=[1],
                  group_id=["CA", "TN", "TN", "TN"])


print(input_pool.get_group_id())

```

Output:
```no-highlight
[13555145920995255203L, 14627267897973961738L, 14627267897973961738L, 14627267897973961738L]
```