input: Write a python function to convert a dictionary into a list of tuples.
  assert dict_to_tuples({'name': 'John', 'age': 44, 'job': 'Engineer'}) == [('name', 'John'), ('age', 44), ('job', 'Engineer')]
  assert dict_to_tuples({'a': 1, 'b': 2, 'c': 3}) == [('a', 1), ('b', 2), ('c', 3)]
  assert dict_to_tuples({}) == []
output: def dict_to_tuples(d):
      return list(d.items())