pIDLy does not work with multiprocessing

[piyanatk]

I am trying to spawn multiple pidly sessions as child processes with multiprocessing, and it does not work. It might be related to this issue.

from multiprocessing import Pool
import pidly

def run(i):
    print i
    idl = pidly.IDL()
    idl.close()

pool = Pool(4)
pool.map(run, range(10))
pool.close()
pool.join()

if you execute the above scrip, you will get.

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Traceback (most recent call last):
  File "test.py", line 10, in <module>
    pool.map(run, range(10))
  File "/data2/piyanat/src/anaconda/lib/python2.7/multiprocessing/pool.py", line 251, in map
    return self.map_async(func, iterable, chunksize).get()
  File "/data2/piyanat/src/anaconda/lib/python2.7/multiprocessing/pool.py", line 567, in get
    raise self._value
ValueError: I/O operation on closed file
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[anthonyjsmith]

No idea I'm afraid!

[piyanatk]

Okay. The problem was related to pexpect/pexpect#86. I had pexpect3.3 installed. After downgrading to 3.2, I was able to run the above codes with no issue.

@anthonyjsmith Do you want to make a note on your README?

[anthonyjsmith]

OK, I think I'll close this. Suspect it's too obscure a problem to mention on the README, but people can always find this issue if they end up Googling for the error message...