Python Pandas - Compute indexer and find the next index value if no exact match

To compute indexer and find the next index value if no exact match, use the index.get_indexer() method. Also set the method parameter to bfill.

At first, import the required libraries −

import pandas as pd

Creating Pandas index −

index = pd.Index([10, 20, 30, 40, 50, 60, 70])

Display the Pandas index −

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

Compute indexer and mask using the "get_indexer". Find the next index value if no exact match using the "method" parameter. The value is set "bfill" −

print("\nGet the indexes...\n",index.get_indexer([30, 25, 58, 50, 55], method="bfill"))

Example

Following is the code −

import pandas as pd

# Creating Pandas index
index = pd.Index([10, 20, 30, 40, 50, 60, 70])

# 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)

# Compute indexer and mask using the "get_indexer"
# Find the next index value if no exact match using the "method" parameter.
# The value is set "bfill"
print("\nGet the indexes...\n",index.get_indexer([30, 25, 58, 50, 55], method="bfill"))

Output

This will produce the following output −

Pandas Index...
Int64Index([10, 20, 30, 40, 50, 60, 70], dtype='int64')

Number of elements in the index...
7

Get the indexes...
[2 2 5 4 5]