On Wed, Jul 24, 2019 at 11:26:26AM +1200, David L Neil wrote: > Clarifying the difference/similarity in appearance between a generator > expression and a tuple, it might help to think that it is the comma(s) > which make it a tuple!
David makes an excellent point here. Except for the special case of the empty tuple, it is *commas* that create tuples, not parentheses. The round brackets are used for grouping, and are optional: py> a = 1, 2, 3 py> type(a) <class 'tuple'> The only times you *need* parens around a non-empty tuple is to group the items or to avoid ambiguity, e.g. a tuple inside a tuple: a = 1, 2, (3, 4, 5), 6 assert len(a) == 4 or when passing a literal tuple as argument to a function: function(1, 2, 3, 4, 5, 6) # six arguments function(1, 2, (3, 4, 5), 6) # four arguments -- Steven _______________________________________________ Tutor maillist - Tutor@python.org To unsubscribe or change subscription options: https://mail.python.org/mailman/listinfo/tutor
