Python Pandas - Return number of unique elements in the Index object

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To return number of unique elements in the Index object, use the index.nunique() method in Pandas. At first, import the required libraries −

import pandas as pd

Creating Pandas index −

index = pd.Index([50, 10, 70, 110, 90, 50, 110, 90, 30])

Display the Pandas index −

print("Pandas Index...\n",index)

Get the number of unique values in the index −

print("\nCount of unique values...\n",index.nunique())

Example

Following is the code −

import pandas as pd

# Creating Pandas index
index = pd.Index([50, 10, 70, 110, 90, 50, 110, 90, 30])

# Display the Pandas index
print("Pandas Index...\n",index)

# Return the number of elements in the Index
print("\nNumber of elements in the index...\n",index.size)

# Return the dtype of the data
print("\nThe dtype object...\n",index.dtype)

# Get the unique values from the index
# Unique values are returned in order of appearance, this does NOT sort
print("\nUnique values from the Index..\n", index.unique())

# Get the number of unique values in the index
print("\nCount of unique values...\n",index.nunique())

Output

This will produce the following output −

Pandas Index...
Int64Index([50, 10, 70, 110, 90, 50, 110, 90, 30], dtype='int64')

Number of elements in the index...
9

The dtype object...
int64

Unique values from the Index..
Int64Index([50, 10, 70, 110, 90, 30], dtype='int64')

Count of unique values...
6
raja
Published on 13-Oct-2021 08:48:01
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