Check if Pandas Index is Monotonic Increasing or Equal

To return if the index is monotonic increasing (only equal or increasing) values, use the index.is_monotonic_increasing property.

At first, import the required libraries −

import pandas as pd

Creating the index −

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

Display the index −

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

Check if the index monotonic increasing −

print("\nIs the Pandas index monotonic increasing?\n",index.is_monotonic_increasing)

Example

Following is the code −

import pandas as pd

# Creating the index
index = pd.Index([10, 20, 20, 30, 40])

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

# Return an array representing the data in the Index
print("\nArray...\n",index.values)

# Check if the index monotonic increasing
print("\nIs the Pandas index monotonic increasing?\n",index.is_monotonic_increasing)

Output

This will produce the following code −

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

Array...
[10 20 20 30 40]

Is the Pandas index monotonic increasing?
True