Python Pandas - Return the frequency object from the PeriodIndex object

To return the frequency object from the PeriodIndex object, use the PeriodIndex.freq property.

At first, import the required libraries −

import pandas as pd

Create a PeriodIndex object. We have set the frequency using the "freq" parameter −

periodIndex = pd.PeriodIndex(['2021-09-25', '2019-10-30', '2020-11-20',
'2021-07-15', '2022-06-12', '2023-07-10'], freq="D")

Display PeriodIndex object −

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

Display PeriodIndex frequency −

print("\nPeriodIndex frequency...\n", periodIndex.freq)

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', '2019-10-30', '2020-11-20',
'2021-07-15', '2022-06-12', '2023-07-10'], freq="D")

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

# Display PeriodIndex frequency
print("\nPeriodIndex frequency...\n", periodIndex.freq)

# Display the month number i.e. 1 = January, 2 = February ... 12 = December
print("\nMonth number...\n", periodIndex.month)

Output

This will produce the following code −

PeriodIndex...
PeriodIndex(['2021-09-25', '2019-10-30', '2020-11-20', '2021-07-15', '2022-06-12', '2023-07-10'],
dtype='period[D]')

PeriodIndex frequency...
<Day>

Month number...
Int64Index([9, 10, 11, 7, 6, 7], dtype='int64')