python - Pythonic way of setting a default -

is there simple way of of setting default in python - setting default in dict?

for instance, let's have dict called foo, may or may not have assigned on key bar. verbose way of doing is:

if not foo.has_key('bar'):   foo['bar'] = 123 

one alternative be:

foo['bar'] = foo.get('bar',123) 

is there standard python way of doing - following, works?

foo['bar'] ||= 123 

doesn't read the documentation?

foo.setdefault('bar', 123)