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

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

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 previous index value if no exact match using the "method" parameter. The value is set "ffill" −

print("\nGet the indexes...\n",index.get_indexer([30, 20, 75, 80, 50, 59], method="ffill")) 

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 previous index value if no exact match using the "method" parameter. # The value is set "ffill" print("\nGet the indexes...\n",index.get_indexer([30, 20, 75, 80, 50, 59], method="ffill"))

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 1 6 6 4 4]