ession lists
****************

   starred_expression       ::= ["*"] or_expr
   flexible_expression      ::= assignment_expression | starred_expression
   flexible_expression_list ::= flexible_expression ("," flexible_expression)* [","]
   starred_expression_list  ::= starred_expression ("," starred_expression)* [","]
   expression_list          ::= expression ("," expression)* [","]
   yield_list               ::= expression_list | starred_expression "," [starred_expression_list]

Except when part of a list or set display, 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.

An asterisk "*" denotes *iterable unpacking*.  Its operand must be an
*iterable*.  The iterable is expanded into a sequence of items, which
are included in the new tuple, list, or set, at the site of the
unpacking.

Added in version 3.5: Iterable unpacking in expression lists,
originally proposed by **PEP 448**.

Added in version 3.11: Any item in an expression list may be starred.
See **PEP 646**.

A trailing comma is required only to create a one-item tuple, such as
"1,"; 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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