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shell_magic exception on OSX with zsh

See original GitHub issue

Spotted this while working on maxpoint/spylon-kernel#33. When launching a kernel which loads the shell_magic:

[MetaKernelApp] ERROR | Can't load '/Users/parente/miniconda3/envs/spylon-kernel-dev/lib/python3.6/site-packages/metakernel/magics/shell_magic.py': error: Timeout exceeded.
<pexpect.pty_spawn.spawn object at 0x109706f98>
command: /bin/bash
args: [b'/bin/bash', b'--rcfile', b'/Users/parente/miniconda3/envs/spylon-kernel-dev/lib/python3.6/site-packages/metakernel/bashrc.sh']
buffer (last 100 chars): '\x1b[?1034h(spylon-kernel-dev) '
before (last 100 chars): '\x1b[?1034h(spylon-kernel-dev) '
after: <class 'pexpect.exceptions.TIMEOUT'>
match: None
match_index: None
exitstatus: None
flag_eof: False
pid: 88201
child_fd: 54
closed: False
timeout: 30
delimiter: <class 'pexpect.exceptions.EOF'>
logfile: None
logfile_read: None
logfile_send: None
maxread: 2000
ignorecase: False
searchwindowsize: None
delaybeforesend: 0.05
delayafterclose: 0.1
delayafterterminate: 0.1
searcher: searcher_re:
    0: re.compile("[$#]")

I’ll try to test this in a plain metakernel install. If it’s known that pexpect and metakernel aren’t py36 compatible, then please disregard.