What are the start and end times of a pandas.Period() object? What role does the parameter freq play in the Period object?

Suppose a Period object is created in pandas as –

In [1]: pd.Period('2021', 'M')
Out [1]: Period('2021-01', 'M')

What are the start and end points of this period object? How does the frequency M affect those start and end points? In fact what role does this frequency play here.

Answer

The freq specifies the length of the period, is it a daily period or monthly period? etc.. For example if you pass a date 2021-03-21 with a D frequency

import pandas as pd
period = pd.Period('2021-03-21', 'D')

then one can know when does the period starts and end by calling the the start_time and end_time attributes

period.start_time
>>> Timestamp('2021-03-21 00:00:00')
period.end_time
>>> Timestamp('2021-03-21 23:59:59.999999999')

Now, consider the whole month of March, a frequency M is a Monthly period

period = pd.Period('2021-03-21', 'M')
period.start_time
>>> Timestamp('2021-03-01 00:00:00')
period.end_time
>>> Timestamp('2021-03-31 23:59:59.999999999')

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