syntax error

[phagosight]

Hello

I am interested in using your code, I have downloaded and tried to run it but face this problem

$ python convert_label.py 
  File "convert_label.py", line 45
    return [f'        intervals [{segmentIndex}]:',
                                                 ^

SyntaxError: invalid syntax

Any ideas why this may be happening? I ran this in the console of a Mac

[Syuparn]

I am very sorry I have missed your comment for months.

It may happen if you use python 3.5 or earlier, which cannot deal with f-strings.
f-strings is a kind of string style which can embed variable values, like

f'hoge_value: {hoge}'