Using CH Test to test a stable seasonal pattern

CHTest.py

# Loading the packages
import pandas as pd
import pmdarima

# Loading the dataset:
data = pd.read_csv('../AirPassengers.csv')
data = data.rename(columns = {'#Passengers':'Passengers'})
data = data.set_index('Month')

# Conducting CH test:
results = pmdarima.arima.CHTest(m=12).estimate_seasonal_differencing_term(data)