cleanup datetime code

remove scories of round half up code and debug code.

Author: vstinner

Lib/datetime.py

@@ -316,13 +316,6 @@ def _divide_and_round(a, b):
 
     return q
 
-def _round_half_up(x):
-    """Round to nearest with ties going away from zero."""
-    if x >= 0.0:
-        return _math.floor(x + 0.5)
-    else:
-        return _math.ceil(x - 0.5)
-
 
 class timedelta:
     """Represent the difference between two datetime objects.

Lib/test/datetimetester.py

@@ -679,7 +679,7 @@ def test_microsecond_rounding(self):
         us_per_day = us_per_hour * 24
         eq(td(days=.4/us_per_day), td(0))
         eq(td(hours=.2/us_per_hour), td(0))
-        eq(td(days=.4/us_per_day, hours=.2/us_per_hour), td(microseconds=1), td)
+        eq(td(days=.4/us_per_day, hours=.2/us_per_hour), td(microseconds=1))
 
         eq(td(days=-.4/us_per_day), td(0))
         eq(td(hours=-.2/us_per_hour), td(0))