Python Pandas - Create a PeriodIndex and set frequency

To create a PeriodIndex, use the pandas.PeriodIndex() method. To set the frequency, use the freq parameter.

At first, import the required libraries −

import pandas as pd

Create a PeriodIndex object. PeriodIndex is an immutable ndarray holding ordinal values indicating regular periods in time. We have set the frequency using the "freq" parameter −

periodIndex = pd.PeriodIndex(['2021-09-25', '2020-10-30', '2020-11-20'], freq="D")

Display PeriodIndex object −

print("PeriodIndex...\n", periodIndex)

Example

Following is the code −

import pandas as pd

# Create a PeriodIndex object
# PeriodIndex is an immutable ndarray holding ordinal values indicating regular periods in time
# We have set the frequency using the "freq" parameter
periodIndex = pd.PeriodIndex(['2021-09-25', '2020-10-30', '2020-11-20'], freq="D")

# Display PeriodIndex object
print("PeriodIndex...\n", periodIndex)

# Display day from the PeriodIndex object
print("\nThe number of days from the PeriodIndex...\n", periodIndex.day)

Output

This will produce the following code −

PeriodIndex...
PeriodIndex(['2021-09-25', '2020-10-30', '2020-11-20'], dtype='period[D]')

The number of days from the PeriodIndex...
Int64Index([25, 30, 20], dtype='int64')