I'm not sure I agree that comparison should be implemented such that it returns True or False in that way, since I don't think it really makes sense to compare two relativedelta objects like that. Consider, what should be the answers to the following comparisons?

relativedelta(months=1) < relativedelta(days=30)
relativedelta(months=5) < relativedelta(day=9, hour=2)
relativedelta(weekday=MO) < relativedelta(weekday=FR)

Basically, because relativedelta doesn't really map to any fixed time period, it doesn't make much sense to directly compare them.

@binnisb What version of dateutil and python are you using, specifically? I would expect relativedelta to raise a TypeError, not return False, and that's what I get with Python 3.6.0, dateutil 2.6.0:

>>> from dateutil import __version__
>>> __version__
'2.6.0'
>>> from dateutil.relativedelta import relativedelta
>>> relativedelta(months=3) < relativedelta(months=4)
---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-cf9dd5f49f4d> in <module>()
----> 1 relativedelta(months=3) < relativedelta(months=4)

TypeError: '<' not supported between instances of 'relativedelta' and 'relativedelta'

Uh oh!

relativedelta does not implement __lt__ #350

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relativedelta does not implement lt #350