Swap MultiIndex Levels in Pandas DataFrame

Last update on December 21 2024 07:42:55 (UTC/GMT +8 hours)

Pandas: Advanced Indexing and Slicing Exercise-5 with Solution

Swap MultiIndex Levels:

Write a Pandas program to swap the levels of a MultiIndex DataFrame.

Sample Solution :

Python Code :

import pandas as pd

# Create a DataFrame
df = pd.DataFrame({
    'X': [1, 6, 8, 3, 7],
    'Y': [5, 2, 9, 4, 1],
    'Z': ['one', 'one', 'two', 'two', 'one']
})

# Set MultiIndex
df = df.set_index(['Z', 'X'])

# Swap the levels of the MultiIndex
df = df.swaplevel()
print(df)

Output:

          Y
X Z     
1 one  5
6 one  2
8 two  9
3 two  4
7 one  1

Explanation:

• Import pandas library.
• Create a DataFrame.
• Set a MultiIndex using columns 'Z' and 'X'.
• Swap the levels of the MultiIndex.
• Print the DataFrame.

Python-Pandas Code Editor:

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