Simplify handling of user notebook paths

Description

I just happened to look at this code and realise that it could be simpler in a couple of small ways.

How Has This Been Tested?

I believe the automated tests should cover it.

Types of changes

• Refactor (refactoring code with no functionality changes)

Checklist:

• My code follows the code style of this project.

Reviewers

@roscar @danilevc

I think ast is not needed anymore then.
Nice one!

Thanks, well spotted on the import. :-)

added 3 commits

• 6009d214 - Use string.Formatter.parse to get variables from path template
• 33376963 - Simplify getting command line arguments to fill notebook template path
• 7a6b505b - Remove unused import

Compare with previous version

merged

mentioned in commit be685a0a

changed milestone to %3.4.2