Using PP test to check stationarity

PPTest.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 PP test:
test = pmdarima.arima.PPTest() # You can choose alpha here, default = 0.05
test.should_diff(data)