F-strings are only compatible with Python ≥3.6, not 3.5

[zikolach]

There is a line result.append(f"{indent}'{arg}' (above)") in ixmp/reporting/describe.py which makes ixmp compatible with python 3.6+ only, but currently we did not drop support of neither python 2 or python 3.5.

[khaeru]

The documentation states that the reporting features are experimental in ixmp 0.2, and only support Python 3.

[zikolach]

The issue is that test suite fails on python 3.5. Is it expected?

[khaeru]

Just a thought: we should check out dependencies and see what is the highest minimum Python version.

[zikolach]

Yeah, recently I had hard time figuring out that one of the dependencies was not working because of not having python 3.7. So pip had it installed, just import didn't work.

[khaeru]

For reference, NEP 29 from numpy (one of our dependencies) has only Python 3.6+ as of yesterday.

[khaeru]

Just a thought: we should check out dependencies and see what is the highest minimum Python version.

As of #263, we require pandas 1.0 which in turn requires Python 3.6.1 (see also pandas-dev/pandas#29212).