Dictionary popitem
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#The popitem method is similar to list.pop. Unlike list.pop, however, popitem pops
#off a random item because dictionaries don't have a "last element" or any order
#whatsoever. This may be very useful if you want to remove and process the items one
#by one in an efficient way (without retrieving a list of the keys first):
d = {'url': 'http://www.python.org', 'spam': 0, 'title': 'Python Web Site'}
print d.popitem()
print d
#Although popitem is similar to the list method pop, there is no dictionary
#equivalent of append. Because dictionaries have no order, such a method wouldn't
#make any sense.
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