fix some style erros on infinity tests

Author: peterpanmj

pandas/tests/test_algos.py

@@ -1271,8 +1271,8 @@ def test_infinity_sort():
     NegInf = libalgos.NegInfinity()
 
     ref_nums = [NegInf, float("-inf"), -1e100, 0, 1e100, float("inf"), Inf]
-    ref_objects = [NegInf, 'A', 'Ac', 'B', 'C', 'D', 'a','z', Inf]
-    
+    ref_objects = [NegInf, 'A', 'Ac', 'B', 'C', 'D', 'a', 'z', Inf]
+
     assert all(Inf >= x for x in ref_nums)
     assert all(Inf > x or x is Inf for x in ref_nums)
     assert Inf >= Inf and Inf == Inf