targetcli saveconfig crashes on Ubuntu 16.04.2 LTS

[Alexander Lebedev]

I installed targetcli (1:3.0~pre4.1~ga55d018-2) on fresh Ubuntu 16.04.2

DISTRIB_ID=Ubuntu
DISTRIB_RELEASE=16.04
DISTRIB_CODENAME=xenial
DISTRIB_DESCRIPTION="Ubuntu 16.04.2 LTS"

and got this error after entering 'saveconfig':
/> saveconfig
Save configuration? [Y/n]: y
Saving new startup configuration
Traceback (most recent call last):
  File "/usr/lib/python2.7/dist-packages/configshell/shell.py", line 990, in run_interactive
    self._cli_loop()
  .......
  File "/usr/local/lib/python2.7/dist-packages/pyparsing.py", line 1049, in wrapper
    ret = func(*args[limit[0]:])
  File "/usr/lib/python2.7/dist-packages/rtslib/config_parser.py", line 228, in _parse_action_attr
    ref_path = " ".join(ref_path.asList())
AttributeError: 'list' object has no attribute 'asList'

same error occurred when I tried to run targetcli-ng from console.

Workaround:
After some investigation, I found that the problem was in the pyparsing python library version:
root@adUntu:/home/ad# pip freeze
....
pyparsing==2.1.10
....

Everything is fine after downgrade it to the version 2.0.3:
root@adUntu:/home/ad# pip install -U pyparsing==2.0.3
Collecting pyparsing==2.0.3
  Downloading pyparsing-2.0.3-py2.py3-none-any.whl
Installing collected packages: pyparsing
  Found existing installation: pyparsing 2.1.10
    Uninstalling pyparsing-2.1.10:
      Successfully uninstalled pyparsing-2.1.10
Successfully installed pyparsing-2.0.3

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.