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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]
Updated on: 14-Oct-2021
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