Python Pandas - Return if the index is monotonic decreasing (only equal or decreasing) values

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

At first, import the required libraries −

import pandas as pd

Creating the index −

index = pd.Index([50, 40, 30, 30, 30])

Display the index −

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

Check if the index monotonic decreasing −

print("\nIs the Pandas index monotonic decreasing?\n",index.is_monotonic_decreasing)

Example

Following is the code −

import pandas as pd

# Creating the index
index = pd.Index([50, 40, 30, 30, 30])

# 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 decreasing
print("\nIs the Pandas index monotonic decreasing?\n",index.is_monotonic_decreasing)

Output

This will produce the following code −

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

Array...
[50 40 30 30 30]

Is the Pandas index monotonic decreasing?
True