python3-pyds9 does not work as soon as python3-imexam is installed.

[gubu]

On a fresh install of artful python3-pyds9 does not work with installed python3-imexam.

python3
Python 3.6.3 (default, Oct 3 2017, 21:45:48)
[GCC 7.2.0] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyds9
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
  File "/usr/lib/python3/dist-packages/pyds9.py", line 800, in <module>
    ds9_xpans()
  File "/usr/lib/python3/dist-packages/pyds9.py", line 251, in ds9_xpans
    if xpa.xpaaccess(b"xpans", None, 1) is None:
AttributeError: module 'xpa' has no attribute 'xpaaccess'

without python3-imexam:
>>> import pyds9
>>>

No error

[Launchpad Janitor (janitor)]

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