[Bugfix] forgot to import os in armDac calibration parsing function

[AndrewLevin]

import os statement was missing

Description

One line change.

Types of changes

• [x] Bug fix (non-breaking change which fixes an issue)
• [ ] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)

Motivation and Context

Would crash if it ever reaches this line, although it seems PyROOT is not actually throwing IOErrors in the current version. Instead it prints:

Error in <TTree::ReadFile>: Cannot open file: ~/test.txt

How Has This Been Tested?

Change is trivial.

Checklist:

• [x] My code follows the code style of this project.
• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [ ] I have added tests to cover my changes.
• [ ] All new and existing tests passed.

[mexanick]

can you please also check other parts of the code. I believe the import os is missing in some other places too

[AndrewLevin]

can you please also check other parts of the code. I believe the import os is missing in some other places too

In anautilities.py, I looked at all of the os.* lines, and am pretty sure this is the only place where the import is missing. I also looked around for other files in gem-plotting-tools where it might be missing but didn't find any.