New submission from Pyry Pakkanen <[email protected]>:
The following self-referencing generator has incorrect output:
def ab_combinations():
#'', 'a', 'b', 'aa', 'ab', 'ba', 'bb', 'aaa', ...
def _deferred_output():
yield ""
tees = tee(output)
#This definition works fine: '', 'a', 'b', 'aa', 'ab', 'ba', ...
l = [(item+"a" for item in tees[0]), (item+"b" for item in tees[1])]
#This definition results in: '', 'b', 'b', 'bb', 'bb', 'bb', ...
#l = [(item+label for item in t) for t, label in zip(tees,"ab")]
while True:
for g in l:
yield next(g)
result, output = tee(_deferred_output())
return result
----------
messages: 149403
nosy: PyryP
priority: normal
severity: normal
status: open
title: Weird behavior with generators with self-referencing output.
type: behavior
versions: Python 2.7, Python 3.2
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Python tracker <[email protected]>
<http://bugs.python.org/issue13595>
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