Replace math.inf with float('inf')

Author: chiragvartak

games.py

@@ -7,7 +7,7 @@
 
 from utils import *  # noqa
 
-infinity = math.inf
+infinity = float('inf')
 
 # ______________________________________________________________________________
 # Minimax Search

tests/test_games.py

@@ -1,6 +1,5 @@
 import pytest
 import collections
-import math
 from games import *
 
 # Creating the games