Python Pandas - Return the label from the index if all of the labels in the index are later than the passed label

To return the label from the index if all of the labels in the index are later than the passed label, use the index.asof() method in Pandas.

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)

Return the label from the index. Returns NaN when if all of the labels in the index are later than the passed label −

print("\nGet the label from the index...\n",index.asof(6))

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)

# Return the label from the index
# Returns NaN when if all of the labels in the index are later than the passed label
print("\nGet the label from the index...\n",index.asof(6))

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 label from the index...
Nan