GH-36659: [Python] Fix pyarrow.dataset.Partitioning.__eq__ when compa…

…ring with other type (#36661)

### Rationale for this change

Ensure that `part == other` doesn't crash with `other` is not a Partitioning instance

Small follow-up on #36462

* Closes: #36659

Authored-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>
Signed-off-by: Joris Van den Bossche <jorisvandenbossche@gmail.com>

python/pyarrow/_dataset.pyx

@@ -2348,10 +2348,9 @@ cdef class Partitioning(_Weakrefable):
  return self.wrapped
 
  def __eq__(self, other):
- try:
+ if isinstance(other, Partitioning):
  return self.partitioning.Equals(deref((<Partitioning>other).unwrap()))
- except TypeError:
- return False
+ return False
 
  def parse(self, path):
  cdef CResult[CExpression] result

python/pyarrow/tests/test_dataset.py

@@ -589,6 +589,7 @@ def test_partitioning():
  partitioning = klass(schema)
  assert isinstance(partitioning, ds.Partitioning)
  assert partitioning == klass(schema)
+ assert partitioning != "other object"
 
  schema = pa.schema([
  pa.field('group', pa.int64()),