How to fix KeyError: 'None of [Index(['column1', 'column2'], dtype='object')... in Python

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We're excited to share with you our newest video, "How to solve KeyError: "None of [Index(['column1', 'column2'], dtype='object')] are in the [columns]" when grouping by nonexistent columns. in Python". 🎥 This series is meticulously designed to arm you with knowledge 🧠 and skills 🛠️ to overcome frequent coding challenges.

Today, we will decipher 🔎 and resolve a common error faced by Python coders: the bit hard to solve KeyError: "None of [Index(['column1', 'column2'], dtype='object')] are in the [columns]" when grouping by nonexistent columns.. Here is a snapshot of the code of the video:

Troubling Scenario: ❗️

import pandas as pd

df = pd.DataFrame({'col1': [1, 2], 'col2': [3, 4]})

Unwanted Result: 🚫
KeyError: "None of [Index(['column1', 'column2'], dtype='object')] are in the [columns]" when grouping by nonexistent columns.

Effective Resolution: ✔️

import pandas as pd

df = pd.DataFrame({'col1': [1, 2], 'col2': [3, 4]})

Desired Output: 🏁
Empty DataFrame
Columns: []
Index: [(1, 3), (2, 4)]

In this detailed walkthrough, we will illuminate 💡 the underlying cause of this error, and offer a comprehensive explanation: In Code1, the KeyError occurs because 'column1' and 'column2' do not exist in the DataFrame. Correct it by grouping by the existing columns 'col1' and 'col2' as shown in Code2. 🎯

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