Dopo ulteriori indagini, la cosa sembra legata al
http://bugs.python.org/issue1488934
in particolare:
###
$ cat produce.py
import sys
for x in range(400):
print 'line '*20
if 'flush' in sys.argv:
try:
sys.stdout.flush()
except IOError:
if 'pass' in sys.argv:
pass
else:
raise
###
ha come effetto:
$ python produce.py | head -1
line line line line line line line line line line line line line line line
line line line line line
Traceback (most recent call last):
File "produce.py", line 4, in <module>
sys.stdout.write('line '*20+'\n')
IOError: [Errno 32] Broken pipe
$ python produce.py | head -1
line line line line line line line line line line line line line line line
line line line line line
close failed in file object destructor:
Error in sys.excepthook:
Original exception was: <--------------- random, a volte IOError, a volte
errore del distruttore
$ python produce.py flush | head -1
line line line line line line line line line line line line line line line
line line line line line
Traceback (most recent call last):
File "produce.py", line 7, in <module>
sys.stdout.flush()
IOError: [Errno 32] Broken pipe <------------- "sempre" IOError (ho
provato un po' di volte)
$ python produce.py flush pass | head -1
line line line line line line line line line line line line line line line
line line line line line
sempre OK (idem, per un numero N << infinito di prove)
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