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set_index()

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Let’s read the budget.xlsx file into a DataFrame:

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import pandas as pd\n\nbudget = pd.read_excel("budget.xlsx")\n\nbudget
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Output:

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Let’s say we want the Store Code column to serve as the index of our DataFrame. We can achieve this using the set_index() method:

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budget.set_index(keys="Store Code", inplace=True)\n\nbudget
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Output:

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As we can see above, the Store Code column is no longer a regular column in our DataFrame - it has become the new index.

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reset_index()

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There is a complementary method called reset_index(), which moves the current index back into a column position and creates a brand new numeric pandas index.

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budget.reset_index()
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Output:

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\n","frontmatter":{"title":"Pandas set_index() & reset_index() Methods","date":"2021-08-10"}}},"pageContext":{"slug":"/pandas-set-index-and-reset-index-methods/","prev":{"fields":{"slug":"/pandas-nlargest-and-nsmallest-methods/"},"frontmatter":{"modules":null}},"next":{"fields":{"slug":"/using-the-in-keyword-to-check-whether-a-value-exists-in-a-pandas-series/"},"frontmatter":{"modules":null}}}}, "staticQueryHashes": ["3159585216"]}