Python Pandas - Return unique values in the index

To return unique values in the index, use the index.unique() method in Pandas. At first, import the required libraries -

import pandas as pd

Creating Pandas index −

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

Display the Pandas index −

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

Get the unique values from the index. Unique values are returned in order of appearance, this does NOT sort −

index.unique()

Example

Following is the code −

import pandas as pd

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

Output

This will produce the following output −

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

Number of elements in the index...
8

The dtype object...
int64

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