PEP 3132 -- Extended Iterable Unpacking

This PEP proposes a change to iterable unpacking syntax, allowing to specify a "catch-all" name which will be assigned a list of all items not assigned to a "regular" name.

なぜ提案したか（Rationale）

Many algorithms require splitting a sequence in a "first, rest" pair. With the new syntax,

first, rest = seq[0], seq[1:]

is replaced by the cleaner and probably more efficient:

first, *rest = seq