endlessly looping
add heuristic to starmap
fix: distance function, type compatibilities
[impl] count inversions
start home/tictactoe
start home/tictactoe
[refac] extract function `wins` and use it for both X and O
[impl] days_diff (using datetime)
[refac] rename 'next' to 'current'
[test] add failing test (infinite?)
[refac] 2to3
... and one character more shaved off
[refac] 2to3
[test] limit test cases to get under 0.2 s/test
Merge branch 'octocat'
Merge branch 'py3'
[refac] add framework for n-d slicing
[refac] express everyting in terms of slice2d
[refac] separate slicing from side-checking
[refac] remove unneeded intermediate function 'column'