internals: remove invalid test

'<M8[ns]' - '<M8[ns]' = '<m8[ns]' , other binop are invalid.

Author: holymonson

pandas/core/internals/__init__.py

@@ -2788,10 +2788,10 @@ def set(self, locs, values, check=False):
  self.values[locs] = values
 
  def eval(self, func, other, try_cast=False, **kwargs):
- block = super().eval(func, other, try_cast=try_cast, **kwargs)[0]
+ block = super(DatetimeBlock, self).eval(func, other, try_cast=try_cast,
+ **kwargs)[0]
  if try_cast:
- if isinstance(other,
- (tslibs.Timestamp, np.datetime64, datetime, date)):
+ if isinstance(other, (np.datetime64, date)):
  block = TimeDeltaBlock(block.values, block.mgr_locs,
  ndim=block.ndim)
  elif isinstance(other, ABCDateOffset):

pandas/tests/internals/test_internals.py

@@ -1238,7 +1238,6 @@ class TestCanHoldElement(object):
  (2**63, 'complex128'),
  (True, 'bool'),
  (np.timedelta64(20, 'ns'), '<m8[ns]'),
- (np.datetime64(20, 'ns'), '<M8[ns]'),
  ])
  @pytest.mark.parametrize('op', [
  operator.add,
@@ -1249,15 +1248,16 @@ class TestCanHoldElement(object):
  operator.pow,
  ], ids=lambda x: x.__name__)
  def test_binop_other(self, op, value, dtype):
- skip = {(operator.add, 'bool'),
- (operator.sub, 'bool'),
- (operator.mul, 'bool'),
- (operator.truediv, 'bool'),
- (operator.mod, 'i8'),
- (operator.mod, 'complex128'),
- (operator.mod, '<M8[ns]'),
- (operator.mod, '<m8[ns]'),
- (operator.pow, 'bool')}
+ skip = {
+ (operator.add, 'bool'),
+ (operator.sub, 'bool'),
+ (operator.mul, 'bool'),
+ (operator.truediv, 'bool'),
+ (operator.mod, 'i8'),
+ (operator.mod, 'complex128'),
+ (operator.mod, '<m8[ns]'),
+ (operator.pow, 'bool'),
+ }
  if (op, dtype) in skip:
  pytest.skip("Invalid combination {},{}".format(op, dtype))
  e = DummyElement(value, dtype)