(python2.1-ref.info)Expression lists


Expression lists
================

     expression_list:      expression ("," expression)* [","]

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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