{str(x)} → {x}

[DimitriPapadopoulos]

This is the default, from Format Specification Mini-Language:

A general convention is that an empty format specification produces the same result as if you had called str() on the value. A non-empty format specification typically modifies the result.

[wtclarke]

Hi thanks for your continued interest in spec2nii. I'm closing this PR as it is purely cosmetic, and whilst I don't doubt what you say, I have no desire to create unnecessary code changes. In general, changes can introduce subtle bugs and also complicates using tools like git blame.