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Diffstat (limited to 'Doc/reference/expressions.rst')
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diff --git a/Doc/reference/expressions.rst b/Doc/reference/expressions.rst index 33fbeec..4d2ec9a 100644 --- a/Doc/reference/expressions.rst +++ b/Doc/reference/expressions.rst @@ -183,6 +183,9 @@ by considering each of the :keyword:`for` or :keyword:`if` clauses a block, nesting from left to right, and evaluating the expression to produce an element each time the innermost block is reached. +Note that the comprehension is executed in a separate scope, so names assigned +to in the target list don't "leak" in the enclosing scope. + .. _lists: @@ -340,6 +343,12 @@ suspended. The only difference is that a generator function cannot control where should the execution continue after it yields; the control is always transfered to the generator's caller. +The :keyword:`yield` statement is allowed in the :keyword:`try` clause of a +:keyword:`try` ... :keyword:`finally` construct. If the generator is not +resumed before it is finalized (by reaching a zero reference count or by being +garbage collected), the generator-iterator's :meth:`close` method will be +called, allowing any pending :keyword:`finally` clauses to execute. + .. index:: object: generator The following generator's methods can be used to control the execution of a @@ -428,6 +437,9 @@ generator functions:: .. seealso:: + :pep:`0255` - Simple Generators + The proposal for adding generators and the :keyword:`yield` statement to Python. + :pep:`0342` - Coroutines via Enhanced Generators The proposal to enhance the API and syntax of generators, making them usable as simple coroutines. |