Raymond Hettinger <[email protected]> added the comment:
The "RuntimeError: maximum recursion depth exceeded" message is normally only
triggered by pure Python recursion, so I would not have expected it here, but
there should be some sort of graceful MemoryError or somesuch rather than a
segfault.
The following code narrows it down to some issue in starmap():
def gstarmap(func, iterable):
for tup in iterable:
yield func(*tup)
def mylist(iterable):
return [x for x in iterable]
a = b = [1]
for i in xrange(100000):
# Things that trigger a segfault:
#a = starmap(add, izip(a, b))
#a = starmap(add, iter( (a, b) ))
a = starmap(add, (a, b) )
# Things that exit cleanly with a RuntimeError
#a = gstarmap(add, iter( (a, b) ))
#a = (x+y for x, y in iter( (a, b) ))
mylist(a)
One possibility may be that starmap.next needs to clear StopIteration
exceptions in the same way as PyIter_Next():
if (result == NULL &&
PyErr_Occurred() &&
PyErr_ExceptionMatches(PyExc_StopIteration))
PyErr_Clear();
----------
priority: normal -> low
title: Segfault with starmap and izip combo -> Segfault with deeply nested
starmap calls
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Python tracker <[email protected]>
<http://bugs.python.org/issue14507>
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