mars-project / mars-project/mars
[BUG] Series with multi index accessing data by index error
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- Dominant language
- Python
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Description
**Describe the bug**
Series with multi index accessing data by index error, but pandas works well.
**To Reproduce**
```python
import pandas as pd
arrays = [["m1", "m2", "m3"], ["n1", "n2", "n3"]]
idx = pd.MultiIndex.from_arrays(arrays, names=("idx_1", "idx_2"))
s = md.Series([1, 2, 3], index=multi_index)
s[("m1", "n1")]
>>> NotImplementedError: type is not support for getitem
```
**Expected behavior**
```python
>>> (No error happens)
```
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by running the provided Python reproduction and trace the Series indexing entry point used by s[("m1", "n1")]. Compare the behavior with pandas and verify that tuple-based access on a MultiIndex no longer raises NotImplementedError while existing indexing behavior remains intact.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- pandas, python
- Domain
- data
- Issue type
- Bug
- Difficulty
- 3/5
- Estimated time
- 1-2 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 35/100