How to fix ValueError: cannot reindex from a duplicate axis when setting an ... in Python

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We're excited to share with you our newest video, "How to solve ValueError: cannot reindex from a duplicate axis when setting an index in a DataFrame. 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 ValueError: cannot reindex from a duplicate axis when setting an index in a DataFrame.. Here is a snapshot of the code of the video:

Troubling Scenario: ❗️

import pandas as pd

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


Unwanted Result: 🚫
ValueError: cannot reindex from a duplicate axis when setting an index in a DataFrame.

Effective Resolution: ✔️

import pandas as pd

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

Desired Output: 🏁

A
0 1
1 2
2 3

In this detailed walkthrough, we will illuminate 💡 the underlying cause of this error, and offer a comprehensive explanation: In Code1, reindexing fails because the DataFrame's index has duplicates. Code2 works as it reindexes with unique indices matching the DataFrame's original index. To fix Code1, ensure the indices are unique. 🎯

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