Preference Win Rate Computation

Problem

Compute a win rate from wins, losses, and ties.

With tie_mode 'exclude' ties are dropped, with 'half' they count as 0.5, and any other value (including 'include') counts them as wins. Return 0.0 when the denominator is zero.

Hint

Win rates are only comparable when everyone handles ties the same way.

Test cases

case 1

in: [8,2,0,"exclude"]

expected: 0.8

case 2

in: [8,2,5,"half"]

expected: 0.7

case 3

in: [8,2,5,"include"]

expected: 0.8666666666666667

case 4

in: [0,0,0,"half"]

expected: 0

Starter codePython

def preference_win_rate(wins, losses, ties, tie_mode):
    # Your code here
    pass

4 test cases · run your code against them in the editor