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I know this is one way, by placing a comma:
>>> empty = ()
>>> singleton = 'hello', # <-- note trailing comma
>>> len(empty)
0
>>> len(singleton)
1
>>> singleton
('hello',)
Source: http://docs.python.org/tutorial/datastructures.html
Are there more ways to define a tuple with only 1 item?
But the built-in syntax is there for a reason.