Message8563

python-dateutil defines class dateutil.relativedelta.relativedelta with __add__() method, which allows addition operation between instances of datetime.date and dateutil.relativedelta.relativedelta.

$ python2.7 -c 'import datetime, dateutil.relativedelta; print(datetime.date(2014, 5, 22) + dateutil.relativedelta.relativedelta(months=3))'
2014-08-22
$ jython2.7 -c 'import datetime, dateutil.relativedelta; print(datetime.date(2014, 5, 22) + dateutil.relativedelta.relativedelta(months=3))'
Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/usr/share/jython-2.7/Lib/datetime.py", line 925, in __add__
    raise TypeError
TypeError