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Calling sum() on a list of timedelta objects results in TypeError: unsupported operand type(s) for +: 'int' and 'datetime.timedelta'
Here's a script that illustrates this behaviour: (also attached)
import datetime
x = [datetime.timedelta(1), datetime.timedelta(2)]
print(x[0] + x[1]) # datetime.timedelta(3)
print(sum(x)) # TypeError: unsupported operand type(s) for +: 'int' and 'datetime.timedelta'
The bug is present in all version of Python 2 and Python 3