Python格式timedelta到字符串

from datetime import timedelta

td = timedelta(days=3, hours=2, minutes=15)
td_str = str(td)

print(td_str)

3 days, 2:15:00

from datetime import timedelta

td = timedelta(days=3, hours=2, minutes=15)
td_str = "{} days, {:02}:{:02}:{:02}".format(td.days, td.seconds // 3600, (td.seconds // 60) % 60, td.seconds % 60)

print(td_str)

3 days, 02:15:00