AttributeError: 'Task' object has no attribute '_Task__obj', mosek

[Grace G.]

I use mosek mio optimizer, and it finished optimization with feasible solution. however when I try to fetch the solution result using:

        xx = [0.] * n

        task.getxxslice(mosek.soltype.itg, offsetx + 0, offsetx + n, xx)

it gives me this error:

Traceback (most recent call last):

  File "/home/ubuntu/.pyenv/versions/3.7.7/lib/python3.7/site-packages/IPython/core/interactiveshell.py", line 3331, in run_code

    exec(code_obj, self.user_global_ns, self.user_ns)

  File "<ipython-input-6-b7fe301b9f0d>", line 1, in <module>

    task.getxxslice(mosek.soltype.itg,offsetx,offsetx+n,xx)

  File "/home/ubuntu/.pyenv/versions/3.7.7/lib/python3.7/site-packages/mosek/__init__.py", line 5040, in getxxslice

    res = self.__obj.getxxslice(_arg1_whichsol_,_arg2_first_,_arg3_last_,_arg4_xx_)

AttributeError: 'Task' object has no attribute '_Task__obj'

[Michal Adamaszek]

That indicates that the task object had already been garbage collected before your call. The most typical scenario is that you are trying to use it outside of the "with" scope where it was created. You should track the structure of your code for such issues.

For example it can happen if you have:

def makemytask():

   with env.Task() as task:

      # make and solve the task

      return task

task=makemytask()

task.getxx(...)  #UPS!

If that doesn't help than a more complete reproducible example would be necessary.

[Grace G.]

you are absolutely right. Problem solved. Thanks a lot