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author | Ezio Melotti <ezio.melotti@gmail.com> | 2013-01-20 14:34:21 (GMT) |
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committer | Ezio Melotti <ezio.melotti@gmail.com> | 2013-01-20 14:34:21 (GMT) |
commit | 5246f66e5e2ac8dc04871f7060235e1d70767458 (patch) | |
tree | 80271438477e4a8cbfb3c2b9ca0db37263e0393d /Doc | |
parent | 81b46ec0e5382735778d7ede92992f7d70a54d94 (diff) | |
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#16557: update functional howto -- "return value" is valid after PEP 380. Initial patch by Ramchandra Apte.
Diffstat (limited to 'Doc')
-rw-r--r-- | Doc/howto/functional.rst | 11 |
1 files changed, 4 insertions, 7 deletions
diff --git a/Doc/howto/functional.rst b/Doc/howto/functional.rst index b621a84..d241f1a 100644 --- a/Doc/howto/functional.rst +++ b/Doc/howto/functional.rst @@ -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 |