Python Pandas - Indicate duplicate index values

To indicate duplicate index values, use the index.duplicated() method.

At first, import the required libraries −

import pandas as pd

Creating the indexwith some duplicates −

index = pd.Index(['Car','Bike','Airplane','Ship','Airplane'])

Display the index −

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

Indicate duplicate index values as True, rest False. By default, it keeps the first occurrence of the duplicate value unmarked −

print("\nIndicating duplicate values...\n", index.duplicated())

Example

Following is the code −

import pandas as pd

# Creating the index with some duplicates
index = pd.Index(['Car','Bike','Airplane','Ship','Airplane'])

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

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

# get the dimensions of the data
print("\nGet the dimensions...\n",index.ndim)

# Indicate duplicate index values as True, rest False
# By default it keeps the first occurrence of the duplicate value unmarked
print("\nIndicating duplicate values...\n", index.duplicated())

Output

This will produce the following code −

Pandas Index with duplicates...
Index(['Car', 'Bike', 'Airplane', 'Ship', 'Airplane'], dtype='object')

The dtype object...
object

Get the dimensions...
1

Indicating duplicate values...
[False False False False True]