QST: hi guys i have an question on creating a series in pandas diamonds['Quality–color'] = diamonds.cut + ', ' + diamonds.color after running this code why iam getting two columns as  'Quality–color'
- [ ] I have searched the [[pandas] tag](https://stackoverflow.com/questions/tagged/pandas) on StackOverflow for similar questions.

- [ ] I have asked my usage related question on [StackOverflow](https://stackoverflow.com).

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#### Question about pandas

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```python
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