Generate a time range (start_time, end_time) based on a given timestamp, with intervals last 30 minutes completed. Using pendulum package

generate_30min_time_range.py

import pendulum

def generate_30min_time_range(timestamp_str):
    timestamp = pendulum.parse(timestamp_str)
    start_time = timestamp.start_of('hour')
    if timestamp.minute >= 30:
        start_time = start_time.add(minutes=30)
    result = []
    while start_time <= timestamp:
        result.append(start_time)
        start_time = start_time.add(minutes=30)

    result_str = [dt.format("YYYY-MM-DDTHH:mm:ss") for dt in result]
    end_time = ",".join(result_str)
    start_time = pendulum.parse(end_time).subtract(minutes=30).format("YYYY-MM-DDTHH:mm:ss")
    return start_time, end_time

print(generate_30min_time_range("2023-11-11T09:35:00")) # ('2023-11-11T09:00:00', '2023-11-11T09:30:00')
print(generate_30min_time_range("2023-11-11T09:30:00")) # ('2023-11-11T09:00:00', '2023-11-11T09:30:00')
print(generate_30min_time_range("2023-11-11T09:15:00")) # ('2023-11-11T08:30:00', '2023-11-11T09:00:00')
print(generate_30min_time_range("2023-11-11T07:01:00")) # ('2023-11-11T06:30:00', '2023-11-11T07:00:00')