5.12 Expression lists
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An expression list containing at least one comma yields a tuple. The length of the
tuple is the number of expressions in the list. The expressions are evaluated from left to
right.
The trailing comma is required only to create a single tuple (a.k.a. a singleton);
it is optional in all other cases. A single expression without a trailing comma doesn't
create a tuple, but rather yields the value of that expression. (To create an empty tuple,
use an empty pair of parentheses: ().)
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