Python – Remove a level using the name of the level and return the index

To remove a level using the name of the level and return the index, use the multiIndex.droplevel() method in Pandas. Set the name of the level to be removed as parameter.

At first, import the required libraries -

import pandas as pd

Create a multi-index. The names parameter sets the names for the levels in the index

multiIndex = pd.MultiIndex.from_arrays([[5, 10], [15, 20], [25, 30], [35, 40]], names=['a', 'b', 'c', 'd'])

Display the multi-index −

print("Multi-index...\n", multiIndex)

Dropping a level using the level name. We have passed the name of the level to be removed as a parameter −

print("\nDropping a level...\n", multiIndex.droplevel('b'))

Example

Following is the code −

import pandas as pd

# Create a multi-index
# The names parameter sets the names for the levels in the index
multiIndex = pd.MultiIndex.from_arrays([[5, 10], [15, 20], [25, 30], [35, 40]],
names=['a', 'b', 'c', 'd'])

# display the multi-index
print("Multi-index...\n", multiIndex)

# Dropping a level using the level name
# We have passed the name of the level to be removed as a parameter
print("\nDropping a level...\n", multiIndex.droplevel('b'))

Output

This will produce the following output −

Multi-index...
MultiIndex([( 5, 15, 25, 35),(10, 20, 30, 40)],names=['a', 'b', 'c', 'd'])

Dropping a level...
MultiIndex([( 5, 25, 35),(10, 30, 40)],names=['a', 'c', 'd'])