Ian Bicking: the old part of his blog

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>>> str.join(' ', ('Polly','wants','a','cracker'))
'Polly wants a cracker'
>>> join = str.join
>>> join(' ', ('this','works','too'))
'this works too'

If you don't like people doing sep.join(iterator), you may start your own crusade -- oh, you've already done it :)
Comment on Python nit, chapter 1
by Baczek