How to fix KeyError when using dict in DataFrame.agg() with keys not matchin... in Python

Hello, Dedicated Coders! 🖥️💡

Troubling Scenario: ❗️

import pandas as pd

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

Unwanted Result: 🚫

Effective Resolution: ✔️

import pandas as pd

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

Desired Output: 🏁

A 3
B 7
dtype: int64

In this detailed walkthrough, we will illuminate 💡 the underlying cause of this error, and offer a comprehensive explanation: Code1 causes a KeyError because it tries to aggregate column 'C', which doesn't exist in the DataFrame. Fix by using existing columns (e.g., 'A' or 'B') in the `agg` method. 🎯

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