Merge pull request #12 from cwendt94/FeaturePowerRanking#9

Feature power ranking#9

README.md

@@ -119,6 +119,13 @@ Team(Team 1)
 >>> matchups[0].away_team
 Team(Team 10)
 ```
+### Get power rankings
+```python
+>>> from ff_espn_api import League
+>>> league = League(1234, 2018)
+>>> league.power_rankings(week=13)
+[('70.85', Team(Team 7)), ('65.20', Team(Team 1)), ('62.45', Team(Team 8)), ('57.70', Team(THE KING)), ('45.10', Team(Team Mizrachi)), ('42.80', Team(Team 10)), ('40.65', Team(Team Viking Queen)), ('37.30', Team(Team 2)), ('27.85', Team(Team 5)), ('20.40', Team(FANTASY GOD))]
+```
 
 ### Helper functions
 ```python

ff_espn_api/league.py

@@ -9,6 +9,7 @@
 from .settings import Settings
 from .matchup import Matchup
 from .pick import Pick
+from .utils import power_points, two_step_dominance
 
 
 def checkRequestStatus(status: int) -> None:
@@ -277,3 +278,24 @@ def scoreboard(self, week=None):
                     matchup.away_team = team
 
         return matchups
+
+    def power_rankings(self, week):
+        '''Return power rankings for any week'''
+
+        if week <= 0 or week > self.current_week:
+            week = self.current_week
+        # calculate win for every week
+        win_matrix = []
+        teams_sorted = sorted(self.teams, key=lambda x: x.team_id,
+                              reverse=False)
+
+        for team in teams_sorted:
+            wins = [0]*32
+            for mov, opponent in zip(team.mov[:week], team.schedule[:week]):
+                opp = int(opponent.team_id)-1
+                if mov > 0:
+                    wins[opp] += 1
+            win_matrix.append(wins)
+        dominance_matrix = two_step_dominance(win_matrix)
+        power_rank = power_points(dominance_matrix, teams_sorted, week)
+        return power_rank

ff_espn_api/utils.py

@@ -0,0 +1,51 @@
+# Helper functions for power rankings
+
+def square_matrix(X):
+    '''Squares a matrix'''
+    result = [[0.0 for x in range(len(X))] for y in range(len(X))]
+
+    # iterate through rows of X
+    for i in range(len(X)):
+
+        # iterate through columns of X
+        for j in range(len(X)):
+
+            # iterate through rows of X
+            for k in range(len(X)):
+                result[i][j] += X[i][k] * X[k][j]
+
+    return result
+
+
+def add_matrix(X, Y):
+    '''Adds two matrices'''
+    result = [[0.0 for x in range(len(X))] for y in range(len(X))]
+
+    for i in range(len(X)):
+
+        # iterate through columns
+        for j in range(len(X)):
+            result[i][j] = X[i][j] + Y[i][j]
+
+    return result
+
+
+def two_step_dominance(X):
+    '''Returns result of two step dominance formula'''
+    matrix = add_matrix(square_matrix(X), X)
+    result = [sum(x) for x in matrix]
+    return result
+
+
+def power_points(dominance, teams, week):
+    '''Returns list of power points'''
+    power_points = []
+    for i, team in zip(dominance, teams):
+        avg_score = sum(team.scores[:week]) / week
+        avg_mov = sum(team.mov[:week]) / week
+
+        power = '{0:.2f}'.format((int(i)*0.8) + (int(avg_score)*0.15) +
+                                 (int(avg_mov)*0.05))
+        power_points.append(power)
+    power_tup = [(i, j) for (i, j) in zip(power_points, teams)]
+    return sorted(power_tup, key=lambda tup: float(tup[0]), reverse=True)

tests/unit/test_league.py

@@ -180,4 +180,20 @@ def test_draft(self, m):
         self.assertEqual(repr(first_pick), 'Pick(Le\'Veon Bell, Team(Rollin\' With Mahomies))')
         self.assertEqual(third_pick.round_num, 1)
         self.assertEqual(third_pick.round_pick, 3)
+
+    @requests_mock.Mocker()
+    def test_power_rankings(self, m):
+        self.mock_setUp(m)
+
+        league = League(self.league_id, self.season)
+
+        invalid_week = league.power_rankings(0)
+        current_week = league.power_rankings(league.current_week)
+        self.assertEqual(invalid_week, current_week)
+
+        valid_week = league.power_rankings(13)
+        self.assertEqual(valid_week[0][0], '71.70')
+        self.assertEqual(repr(valid_week[0][1]), 'Team(Misunderstood  Mistfits )')
+
+