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authorEzio Melotti <ezio.melotti@gmail.com>2013-01-20 14:34:21 (GMT)
committerEzio Melotti <ezio.melotti@gmail.com>2013-01-20 14:34:21 (GMT)
commit5246f66e5e2ac8dc04871f7060235e1d70767458 (patch)
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#16557: update functional howto -- "return value" is valid after PEP 380. Initial patch by Ramchandra Apte.
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@@ -479,13 +479,10 @@ Here's a sample usage of the ``generate_ints()`` generator:
You could equally write ``for i in generate_ints(5)``, or ``a,b,c =
generate_ints(3)``.
-Inside a generator function, the ``return`` statement can only be used without a
-value, and signals the end of the procession of values; after executing a
-``return`` the generator cannot return any further values. ``return`` with a
-value, such as ``return 5``, is a syntax error inside a generator function. The
-end of the generator's results can also be indicated by raising
-:exc:`StopIteration` manually, or by just letting the flow of execution fall off
-the bottom of the function.
+Inside a generator function, ``return value`` is semantically equivalent to
+``raise StopIteration(value)``. If no value is returned or the bottom of the
+function is reached, the procession of values ends and the generator cannot
+return any further values.
You could achieve the effect of generators manually by writing your own class
and storing all the local variables of the generator as instance variables. For