Force expansion of contents rather than iterator.
Force expansion of contents rather than iterator.

Python 3 implicitly uses an iterator in a for loop,
but we're deleting things from the dict so we need
to explicitly expand in advance.

daviddrysdale/python-phonenumbers,daviddrysdale/python-phonenumbers,agentr13/python-phonenumbers,dongguangming/python-phonenumbers,roubert/python-phonenumbers,gencer/python-phonenumbers,titansgroup/python-phonenumbers,daodaoliang/python-phonenumbers,SergiuMir/python-phonenumbers,daviddrysdale/python-phonenumbers,shikigit/python-phonenumbers