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gh-159061: Document unpacking in generator expressions #159268

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11 changes: 11 additions & 0 deletions Doc/reference/expressions.rst
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Expand Up @@ -967,6 +967,17 @@ For example::
>>> iterator
<generator object <genexpr> at ...>

Like list comprehensions, generator expressions can unpack the iterable
produced by their leading expression by prefixing it with ``*``.
The elements of each iterable are yielded in order::

>>> flattened = (*values for values in [(1, 2), (3, 4)])
>>> list(flattened)
[1, 2, 3, 4]

.. versionadded:: 3.15
Unpacking in generator expressions was introduced in :pep:`798`.

At runtime, a generator expression evaluates to a :term:`generator iterator`
which yields the same values as the corresponding list comprehension::

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