[New-bugs-announce] [issue22761] Catching StopIteraion inside list comprehension

[yotamv]

New submission from yotamv:

Inside a list comprehension expression, if a StopIteration exception is raised, the interpreter assumes the exception was raised by the object Iterated buy the list comprehension expression.

For example, this generator will never stop, and will keep returning empty tuples:

def izip(*args):
    iters = [iter(obj) for obj in args]
    while True:
        yield tuple(next(it) for it in iters)
x = izip([1,2],[3,4])
print(next(x)) #(1,3)
print(next(x)) #(2,4)
print(next(x)) #()

----------
components: Interpreter Core
messages: 230246
nosy: tomirendo
priority: normal
severity: normal
status: open
title: Catching StopIteraion inside list comprehension
type: behavior
versions: Python 3.4

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue22761>
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