Nadeem Vawda added the comment:
It looks like there's also a separate problem in the multiprocessing
module. The following code hangs after hitting a TypeError trying to
pickle one of the TextIOWrapper objects:
import multiprocessing
def read(f): return f.read()
files = [open(path) for path in 3 * ['/dev/null']]
pool = multiprocessing.Pool()
results = pool.map(read, files)
print(results)
----------
nosy: +jnoller, sbt
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<http://bugs.python.org/issue19395>
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