There is a current thread on notations for sets and dicts. A more
general question is: How should the precious pairs of bracketing
characters,(), {}, and [] be used? Currently, parentheses are used for
grouping, function calls and tuples. Curly brackets are used for
dictionaries and, perhaps in the future, for sets. Square brackets are
used for subscripts and dictionaries.
Are these bracketing pairs used in too many ways? Does the language need
more bracketing pairs, perhaps "<<<", ">>>"? Any way to get rid of the
horrible ancient wart of "(a,)" for a tuple of length one?
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