We decided to accept appeals for the "[" issue after all.
Those of you who lost points for this reason may write an appeal (after carefully running the tester file) and include a "print screen" in the appeal (as usual).
If you got your appeal rejected for the "[" issue only, you should submit the original appeal again, as is.
General note: We have encountered several cases of unjustufied appeals, submitted by students who did not run the tester, or did not look into what was wrong in their solution. Such cases will cause reduction of points from now on.
The course staff